RIO 2016Track and field at the Rio OlympicsTeam USA celebrates after winning gold in the men's 4x400-meter relay.Kirby Lee, USA TODAY SportsTeam USA celebrates after competing in the men's 4x400-meter relay final.James Lang, USA TODAY SportsLaShawn Merritt crosses the finish line first for the win in the men's 4x400 relay.Kirby Lee, USA TODAY SportsLaShawn Merritt (USA) anchors the USA to victory during the men's 4x400-meter relay.Kirby Lee, USA TODAY SportsLaShawn Merritt (USA) breaks away as he competes in the men's 4x400 relay final.Andrew P. Scott, USA TODAY SportsLaShawn Merritt (USA) sprints home in the men's 4x400 relay.Guy Rhodes, USA TODAY SportsGil Roberts (USA) runs in the men's 4x400 relay final.Guy Rhodes, USA TODAY SportsTony McQuay hands off to Gil Roberts (USA) in the men's 4x400 relay final.James Lang,USA TODAY SportsKarabo Sibanda (BOT) and Tony McQuay (USA) compete in the men's 4x400-meter relay final.Andrew P. Scott, USA TODAY SportsArman Hall (USA) runs in the men's 4x400 relay final.Guy Rhodes, USA TODAY SportsAllyson Felix (USA) celebrates after winning the women's 4x400-meter final.James Lang, USA TODAY SportsThe U.S. team of Courtney Okolo, Natasha Hastings, Phyllis Francis and Allyson Felix celebrate after winning the women's 4x400 relay.Kirby Lee, USA TODAY SportsPhyllis Francis (USA) hands off the baton to Allyson Felix (USA) in the women's 4x400 final.James Lang, USA TODAY SportsShericka Jackson (JAM) and Phyllis Francis (USA) compete in the women's 4x400-meter relay.Andrew P. Scott, USA TODAY SportsNatasha Hastings (USA) runs in the women's 4x400 final.James Lang, USA TODAY SportsNatasha Hastings (USA) accepts the handoff in the women's 4x400 final.James Lang, USA TODAY SportsMohamed Farah (GBR) celebrates winning the gold medal in the men's 5,000.Erich Schlegel, USA TODAY SportsMohamed Farah (GBR) celebrates after placing first during the men's 5,000-meter final.Kirby Lee, USA TODAY SportsMohamed Farah runs down the back stretch during the men's 5,000 final.Kirby Lee, USA TODAY SportsBernard Lagat (USA) runs during the men's 5,000-meter final.Kirby Lee, USA TODAY SportsChaunte Lowe (USA) reacts during the women's high jump final.Kirby Lee, USA TODAY SportsMatthew Centrowitz (USA) celebrates winning the men's 1500m final during the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Andrew P. Scott-USA TODAY SportsInika McPherson (USA) reacts during the women's high jump final during the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee-USA TODAY SportsInika McPherson (USA) competes in the women's high jump during the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Erich Schlegel-USA TODAY SportsKate Grace (USA) in the women's 800m final during the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsCaster Semenya (RSA) in the women's 800m final during the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsTeam's USA's Allyson Felix (USA), English Gardner, Tianna Bartoletta and Tori Bowie celebrate after winning the women’s 4x100 relay.Geoff Burke, USA TODAY SportsMembers of Team USA react after winning the women's 4X100m relay.Matt Kryger, USA TODAY SportsTori Bowie and Tianna Bartoletta react after winning the women's 4X100m relay final.Matt Kryger, USA TODAY SportsTori Bowie reacts after winning the women's 4x100m relay.James Lang, USA TODAY SportsTianna Bartoletta (USA) runs during the women's 4x100m relay final.James Lang, USA TODAY SportsTori Bowie takes the baton from English Gardner during the women's 4x100m relay.Erich Schlegel, USA TODAY SportsYohan Blake, Nickel Ashmeade, Asafa Powell and Usain Bolt celebrate after the men's 4x100-meter relay.Geoff Burke, USA TODAY SportsUsain Bolt (JAM) celebrates after the men’s 4x100 relay.Geoff Burke, USA TODAY SportsUsain Bolt (JAM) celebrates after anchoring his team to victory during the men's 4x100m relay.James Lang, USA TODAY SportsUsain Bolt and Jamaica won the men's 4x100m relay final.James Lang, USA TODAY SportsUsain Bolt sprints down the stretch in the men's 4x100-meter relay.James Lang, USA TODAY SportsMaria Enrica Spacca and Ayomide Folorunso of Italy react after seeing their time in the women's 4x400m semifinals.James Lang, USA TODAY SportsChristine Amertil of the Bahamas, Ruth Sophia Spelmeyer of Germany and Libania Grenot of Italy in the women's 4x400-meter relay heat.Kirby Lee, USA TODAY SportsTina Sutej of Slovenia during the women's pole vault final.Erich Schlegel, USA TODAY SportsDavid Verburg of the USA finishes ahead of Javon Francis of Jamaica during the men's 4x400m heats.James Lang, USA TODAY SportsUsain Bolt (JAM) wins gold in the men’s 200.Christopher Hanewinckel, USA TODAY SportsUsain Bolt (JAM) reacts as he wins gold in the men’s 200.Christopher Hanewinckel, USA TODAY SportsUsain Bolt (JAM) celebrates with fans after winning the gold medal in the men's 200.John David Mercer, USA TODAY SportsUsain Bolt (JAM) wins gold in the men’s 200.Christopher Hanewinckel, USA TODAY SportsUsain Bolt (JAM) celebrates after winning the men's 200.James Lang, USA TODAY SportsUsain Bolt (JAM) celebrates after winning the men's 200.James Lang, USA TODAY Sports=Usain Bolt (JAM) wins gold in the men’s 200.Christopher Hanewinckel, USA TODAY SportsUsain Bolt (JAM) wins gold in the men’s 200-meter final.Jason Getz, USA TODAY SportsUsain Bolt (JAM) wins gold in the men’s 200.Christopher Hanewinckel, USA TODAY SportsUsain Bolt (JAM) competes in the men's 200-meter final.John David Mercer, USA TODAY SportsUsain Bolt (JAM) competes in the men's 200-meter final.John David Mercer, USA TODAY SportsUsain Bolt (JAM) celebrates after winning the men's 200.James Lang, USA TODAY SportsUsain Bolt (JAM) competes in the men's 200.John David Mercer, USA TODAY SportsUsain Bolt (JAM) races ahead of the pack in the men's 200.James Lang, USA TODAY SportsUsain Bolt (JAM), left, and Lashawn Merritt (USA) walk the track prior to the men's 200-meter final.John David Mercer, USA TODAY SportsAshley Spencer (USA), left, and Dalilah Muhammad (USA) hug after coming in third (Spencer) and first in the women's 400-meter hurdles.Eric Seals, USA TODAY SportsDalilah Muhammad (USA) celebrates finishing first in the women's 400-meter hurdles.Eric Seals, USA TODAY SportsAshley Spencer (USA) reacts after the women's 400-meter hurdles.James Lang, USA TODAY SportsAshley Spencer (USA) took bronze in the women’s 400-meter hurdles.Christopher Hanewinckel, USA TODAY SportsDelilah Muhammad (USA) crosses the finish line to win the women's 400-meter hurdles.James Lang, USA TODAY SportsDalilah Muhammad (USA) competes in the women's 400-meter hurdles.John David Mercer, USA TODAY SportsDalilah Muhammad (USA) crosses the finish line first in the women's 400-meter hurdles.Eric Seals, USA TODAY SportsAshton Eaton (USA) celebrates after winning the decathlon.Kirby Lee, USA TODAY SportsAshton Eaton (USA) celebrates after securing gold in the decathlon.James Lang, USA TODAY SportsAshton Eaton (USA) competes in the men’s 1,500-meter heat during the decathlon.Christopher Hanewinckel, USA TODAY SportsRyan Crouser (USA) poses with his Olympic record after winning the men's shot put.Kirby Lee, USA TODAY SportsRyan Crouser (USA) celebrates after setting an Olympic record throw during the men's shot put final in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee-USA TODAY SportsRyan Crouser (USA) sets an Olympic record with this throw during the men's shot put final.Kirby Lee, USA TODAY SportsKate Grace (USA) runs in the women's 800-meter semifinals.Christopher Hanewinckel, USA TODAY SportsJoanna Jozwik (POL) runs ahead of Shelayna Oskan-Clarke (GBR) in the women's 800m semifinal during track and field competition in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Christopher Hanewinckel-USA TODAY SportsDamian Warner (CAN) during the decathlon javelin in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee-USA TODAY SportsBen Blankenship (USA) during the men's 1500m semifinals in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsTianna Bartoletta (USA) hands the baton to Allyson Felix (USA) during the women's 4x100m relay heats in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Christopher Hanewinckel-USA TODAY SportsTianna Bartoletta , Allyson Felix , English Gardner and Morolake Akinosun (USA) after the women's 4x100m relay heats in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee-USA TODAY SportsTianna Bartoletta , Allyson Felix , English Gardner and Morolake Akinosun (USA) after the women's 4x100m relay heats in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsAlyxandria Treasure (CAN) during the women's high jump qualifying.Kirby Lee, USA TODAY SportsPau Tonnesen (ESP) during the men's decathlon discus.Kirby Lee, USA TODAY SportsKerron Clement (USA) races Annsert Whyte (JAM) and Thomas Barr (IRL) during the men's 400m hurdles final.James Lang, USA TODAY SportsJoe Kovacs (USA) during the men's shot put qualifying.Kirby Lee, USA TODAY SportsYasmani Copello (TUR) reacts to winning bronze in the men's 400m hurdlesKirbly Lee, USA TODAY SportsZach Ziemek (USA) races during the men's decathlon 110m hurdles heats.James Lang, USA TODAY Sportseronica Campbell-Brown (JAM) hands off to Shelly-Ann Fraser-Pryce (JAM) during the women's 4x100m relay heats.Kirby Lee, USA TODAY SportsBrianna Rollins (USA) , Nia Ali (USA) and Kristi Castlin (USA) celebrate with American flags after claiming medals in the women's 100-meter hurdles.James Lang, USA TODAY SportsKristi Castlin, Brianna Rollins, and Nia Ali (USA) celebrate after winning medals during the women's 100-meter hurdles.Christopher Hanewinckel, USA TODAY SportsNia Ali (USA), Brianna Rollins (USA) and Kristi Castlin (USA) react after the women's 100-meter hurdles.James Lang, USA TODAY SportsBrianna Rollins reacts after winning the women's 100m hurdles final during the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange in Rio de Janeiro, Brazil, on Aug. 17, 2016.James Lang, USA TODAY SportsKristi Castlin (USA) , Brianna Rollins, Pedrya Seymour (BAH) and Nia Ali (USA) race during the women's 100-meter hurdles.James Lang, USA TODAY SportsAndre De Grasse (CAN) and Usain Bolt (JAM) react after the men's 200m semifinals in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsJustin Gatlin (USA) competes in the men’s 200m semifinal during the track and field competition in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Erich Schlegel-USA TODAY SportsElaine Thompson (JAM) defeats Tori Bowie (USA) to win the women's 200m final as Dafine Schippers (NED) in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsElaine Thompson (JAM) defeats Tori Bowie (USA) to win the women's 200m final in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsElaine Thompson (JAM) defeats Tori Bowie (USA) to win the women's 200.James Lang, USA TODAY SportsNia Ali (USA) competes during the women's 100m hurdles semifinal in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Christopher Hanewinckel-USA TODAY SportsKristi Castlin (USA) and Cindy Ofili (GBR) compete during the women's 100m hurdles semifinal in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Eric Seals-USA TODAY SportsTianna Bartoletta (USA) reacts during the women's long jump final.Kirby Lee, USA TODAY SportsTianna Bartoletta (USA) during the women's long jump final.Kirby Lee, USA TODAY SportsBrittney Reese (USA) during the women's long jump final in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee-USA TODAY SportsAshton Eaton of the United States competes during the men's decathlon long jump in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee, USA TODAY SportsHassan Mead of the United States falls down after clipping Mo Farrah of Great Britain during the men's 5000 heats in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee, USA TODAY SportsA general view of hammers on a rack during the men's hammer throw qualifications in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee, USA TODAY SportsA view of the start during the men's 110-meter hurdles finals.Christopher Hanewinckel, USA TODAY SportsDerek Drouin of Canada competes during the men's high jump final.Jason Getz, USA TODAY SportsJenny Simpson, right, celebrates winning the bronze medal during the women's 1,500-meter final.James Lang, USA TODAY SportsRonnie Ash of the USA, right, and Balazs Baji of Hungary during the men's 110-meter hurdles semifinals.James Lang, USA TODAY SportsMaggie Malone of the USA during the women's javelin throw qualifying round.Kirby Lee, USA TODAY SportsFlor Ruiz of Colombia reacts during the women's javelin throw qualifying round.Kirby Lee, USA TODAY SportsRonnie Ash, in blue, competes during the men's 110 hurdles semifinals.Eric Seals, USA TODAY SportsUsain Bolt (JAM) during the men's 200m preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsJustin Gaitlin (USA) during the men's 200m preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsUsain Bolt (JAM) during the men's 200m preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsFabiana Murer (BRA) during the women's pole vault preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Eric Seals-USA TODAY SportsAbdi Waiss Mouhyadin of Djibouti is helped off the track during the men's 1500 preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee, USA TODAY SportsNia Ali of the United States comptes during the women's 110 hurdles heats in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang, USA TODAY SportsChristian Taylor of the United States competes during the men's triple jump final in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Eric Seals, USA TODAY SportsChristian Taylor of the United States celebrates after winning gold in men's triple jump final in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee, USA TODAY SportsAbbey D'Agostino of the United States, right, hugs Nikki Hamblin of New Zealand after their women's 5000 preliminary heat in the Rio 2016 Summer Olympic Games.James Lang, USA TODAY SportsKim Conley and Shelby Houlihan of the United States during the women's 5000 preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee, USA TODAY SportsA view of the start during the women's 5000 preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee, USA TODAY SportsShaunae Miller (BAH) wins the women's 400m final against Allyson Felix (USA) in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Christopher Hanewinckel, USA TODAY SportsSam Kendricks (USA) during the men's pole vault final in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Eric Seals, USA TODAY SportsJohnathan Cabral of Canada and Balazs Baji of Hungary compete during men's 110-meter hurdles.Kyle Terada, USA TODAY SportsA general view during the men's 110-meter hurdles Round 1 heat in the rain.James Lang, USA TODAY SportsSam Kendricks competes in the pole vault.Kyle Terada, USA TODAY SportsAn official responds to rain during the men's 110-meter hurdles.Kyle Terada, USA TODAY SportsRain falls on the track during the men's pole vault final.Eric Seals, USA TODAY SportsRunners compete in the 110-meter hurdles.Kyle Terada, USA TODAY SportsEmma Coburn celebrates the bronze medal in the women's 3000 steeplechase.James Lang, USA TODAY SportsChristian Taylor of United States competes in the men's triple jump athletics event at Estadio Olimpico Joao Havelange during the Rio 2016 Summer Olympic Games.Kirby Lee, USA TODAY SportsHillary Bor of the United States runs during the men's 3000 steeplechase preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang, USA TODAY SportsMichelle-Lee Ayhe of Trinidad and Tobago leads during the women's 200m preliminaries in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kyle Terada, USA TODAY SportsUsain Bolt (JAM) celebrates after winning the men's 100.James Lang, USA TODAY SportsUsain Bolt (JAM) celebrates after winning the men's 100.Eric Seals, USA TODAY SportsUsain Bolt (JAM) celebrates after winning the men's 100.James Lang, USA TODAY SportsUsain Bolt (JAM) celebrates after winning the gold medal during the men's 100.Erich Schlegel, USA TODAY SportsUsain Bolt (JAM) celebrates after winning the men's 100.James Lang, USA TODAY SportsJustin Gatlin (USA) celebrates taking silver during the men's 100.James Lang, USA TODAY SportsUsain Bolt (JAM) wins the men's 100-meter final.James Lang, USA TODAY SportsWayde van Niekerk (RSA) set a world record in the men's 400-meter final.Matt Kryger, USA TODAY SportsWayde Van Niekerk (RSA) poses with the sign after setting a world record during the men's 400.John David Mercer, USA TODAY SportsWayde van Niekerk (RSA) celebrates after winning the gold medal in the men's 400.James Lang, USA TODAY SportsLaShawn Merritt (USA) celebrates after taking the bronze medal during the men's 400-meter final.James Lang, USA TODAY SportsWayde van Niekerk (RSA) celebrates winning the gold medal in the men's 400.Erich Schlegel, USA TODAY SportsWayde Van Niekerk (RSA) reacts after winning the men's 400-meter final.John David Mercer, USA TODAY SportsWayde Van Niekerk (RSA) wins the men's 400-meter final.Kirby Lee, USA TODAY SportsWayde Van Niekerk (RSA) leads the field during the men's 400-meter final.John David Mercer, USA TODAY SportsYulimar Rojas (VEN) leaps during the women's triple jump final.Kirby Lee, USA TODAY SportsJenny Simpson (USA) runs in the women's 1,500-meter semifinals.Eric Seals, USA TODAY SportsYu Wang (CHN) leaps during the men's high jump qualifying round.John David Mercer, USA TODAY SportsUsain Bolt (JAM) during the men's 100-meter semifinals.James Lang-USA TODAY SportsJustin Gatlin (USA) during the men's 100m semifinals in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsAnna Jagaciak (POL) during the women's triple jump final in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.Kirby Lee-USA TODAY SportsSofia Ennaoui (POL) falls during the women's 1500m semifinals in the Rio 2016 Summer Olympic Games at Estadio Olimpico Joao Havelange.James Lang-USA TODAY SportsGenzebe Dibaba (ETH) during the women's 1500m semifinals in the Rio 2016 Summer Olympic Games at EstadioErich Schlegel-USA TODAY SportsElaine Thompson (JAM) reacts after winning the women's 100-meter final.Christopher Hanewinckel, USA TODAY SportsElaine Thompson (JAM) wins the women's 100 final.James Lang, USA TODAY SportsTori Bowie (USA) celebrates after placing second in the women's 100-meter final.Jeffrey Swinger, USA TODAY SportsRunners get off the blocks in the women's 100-meter final.Eric Seals, USA TODAY SportsJeff Henderson celebrates winning the gold medal during the long jump.Jeffrey Swinger, USA TODAY SportsVanessa Chefer (BRA) celebrates after the women's heptathlon.James Lang, USA TODAY SportsClayton Murphy (USA) reacts after the men's 800-meter semifinal.James Lang, USA TODAY SportsMohamed Farah (GBR) celebrates after winning the men's 10,000.James Lang, USA TODAY SportsMohamed Farah (GBR) wins the men's 10,000.Jeffrey Swinger, USA TODAY SportsRunners compete in the men's 10,000-meter final.Daniel Powers, USA TODAY SportsBedan Karoki Muchiri (KEN) and Paul Kipngetich Tanui (KEN) run during the men's 10,000 meters.James Lang, USA TODAY SportsBoris Berian (USA) runs in the pack during the men's 800-meter semifinal.James Lang, USA TODAY SportsCarline Muir (CAN) competes in the women's 400m event.Kirby Lee, USA TODAY SportsZoltan Kovago (HUN) competes in the men's discus throw event.Kirby Lee, USA TODAY SportsPhyllis Francis (USA) runs during the women's track and field 400m preliminaries.James Lang, USA TODAY SportsUsain Bolt (JAM) during the men's track and field 100m preliminaries.James Lang, USA TODAY SportsBarbara Nwaba (USA) competes in the women's heptathlon long jump event.Kirby Lee, USA TODAY SportsDaniel Jasinski (GER) celebrates winning the bronze medal in the men's discus throw event.Kirby Lee, Kirby Lee-USA TODAY SportsRunners jump over a hurdle during the women's track and field 3000m steeplechase preliminary round.Kirby Lee, Kirby Lee-USA TODAY SportsMartin Kupper (EST) competes in the men's discus throw event.Kirby Lee, USA TODAY SportsAndrea Geubelle (USA) competes in the women's triple jump qualifying.Matt Kryger, USA TODAY SportsCharlotta Fougberg (SWE) competes in the women's 3000m steeplechase event.Kirby Lee, USA TODAY SportsColleen Quigley (USA) runs during the women's track and field 3000m steeplechase preliminary round.Kirby Lee, USA TODAY SportsRunners compete in a men's 100m preliminary round heat at Estadio Olimpico Joao Havelange.Matt Kryger, USA TODAY SportsFadwa Sidi Madane (MAR) and Colleen Quigley (USA) run during the women's track and field 3000m steeplechase preliminary round.Kirby Lee, USA TODAY SportsMichelle Carter (USA) celebrates winning the gold medal in the women's shot put.Kirby Lee, USA TODAY SportsMichelle Carter (USA) competes in the women's shot put event.Kirby Lee, USA TODAY SportsVanessa Chefer (BRA) reacts after competing in a women's heptathlon 200-meter heat.James Lang, USA TODAY SportsTori Bowie (USA) and Angela Tenorio (ECU) compete in a women's 100-meter heat.James Lang, USA TODAY SportsShelly-Ann Fraser-Pryce (JAM) reacts after competing in a women's 100-meter heat.James Lang, USA TODAY SportsMichelle-Lee Ahye (TTO) and Asha Philip (GBR) compete in a women's 100-meter heat.James Lang, USA TODAY SportsEnglish Gardner (USA) and Carina Horn (RSA) compete in a women's 100-meter heat.James Lang, USA TODAY SportsBetty Heidler (GER) competes in the women's hammer throw event.Kirby Lee, USA TODAY SportsRosangela Santos (BRA) celebrates winning her heat in the women's 100-meter event.Guy Rhodes, USA TODAY SportsAston Eaton, left, watches his wife Brianne Theisen Eaton of Canada compete during the women's heptathlon high jump event at Estadio Olimpico Joao Havelange in the Rio 2016 Summer Olympic Games.Kirby Lee, USA TODAY SportsRunners compete in a women's 100-meter preliminary heat at Estadio Olimpico Joao Havelange during the 2016 Rio Summer Olympic Games.James Lang, USA TODAY SportsAlmaz Ayana of Ethiopia poses with the scoreboard after setting a world record while winning gold in the women's 10,000 at Estadio Olimpico Joao Havelange in the Rio 2016 Summer Olympic Games.Kirby Lee, USA TODAY SportsUhunoma Osazuwa of Nigeria competes in the women's heptathlon high jump event at Estadio Olimpico Joao Havelange in the Rio 2016 Summer Olympic Games.Kirby Lee, USA TODAY SportsBoris Berian advances to the semifinals of the 800.James Lang, USA TODAY SportsAndrew Evans of the United States competes in the men's discus throw at Estadio Olimpico Joao Havelange in the Rio 2016 Summer Olympic Games.Kirby Lee, USA TODAY SportsAlmaz Ayana of Ethopia celebrates as she crosses the finish line to win gold in the women's 10000 with a world record timel at Estadio Olimpico Joao Havelange during the 2016 Rio Summer Olympic Games.James Lang, USA TODAY SportsClayton Murphy of the United States competes in a men's 800-meter heat at Estadio Olimpico Joao Havelange during the 2016 Rio Summer Olympic Games.James Lang, USA TODAY SportsCompetitiors finish their 100-meter hurdles heat of the women's heptathlon at Estadio Olimpico Joao Havelange during the 2016 Rio Summer Olympic Games.James Lang, USA TODAY Sports