London, UK. 03rd Aug, 2017. London, 03 August 2017. Allyson Felix, 2015 World 400m champion, nine-time World champion & 2017 400m world leader at Team USA press conference ahead of the IAAF World Championships London 2017 at the London Stadium. Credit: Paul Davey/Alamy Live News

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Photo credit: © Paul Davey / Alamy / Afripics
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Keywords: 2017, america, athletes, athletics, championships, competitor, conference, field, iaaf, london, press, sport, states, team, track, united, usatf, world