US athlete Justin Gatlin kneels in front of Jamaica's Usain Bolt after Gatlin won the final of the men's 100m athletics event at the 2017 IAAF World Championships at the London Stadium in London on August 5, 2017. (AFP)

US athlete Christian Coleman and Jamaica's Usain Bolt (R) walk on the track after the final of the men's 100m athletics event at the 2017 IAAF World Championships at the London Stadium in London on August 5, 2017 (AFP)

Justin Gatlin of the U.S. and Usain Bolt of Jamaica (Reuters)

France's Jimmy Vicaut, Jamaica's Usain Bolt, US athlete Christian Coleman, South Africa's Akani Simbine, Jamaica's Yohan Blake, US athlete Justin Gatlin, Britain's Reece Prescod compete during the final of the men's 100m athletics event at the 2017 IAAF World Championships at the London Stadium in London on August 5, 2017. (AFP)

Jamaica's Usain Bolt speaks to the media after the final of the men's 100m athletics event at the 2017 IAAF World Championships at the London Stadium in London on August 5, 2017. (AFP)

Jamaica's bronze medal winner Usain Bolt, center, competes in the men's 100m final during the World Athletics Championships in London Saturday, Aug. 5, 2017. (AP)

Jamaica's Usain Bolt kisses the track after the men's 100m athletics event at the 2017 IAAF World Championships at the London Stadium in London on August 5, 2017. (AFP)

First placed US athlete Justin Gatlin, second placed US athlete Christian Coleman and third placed Jamaica's Usain Bolt compete in the final of the men's 100m athletics event at the 2017 IAAF World Championships at the London Stadium in London on August 5, 2017. (AFP)

Britain's Reece Prescod, US athlete Justin Gatlin, Jamaica's Yohan Blake, South Africa's Akani Simbine, US athlete Christian Coleman, Jamaica's Usain Bolt compete in the final of the men's 100m athletics event at the 2017 IAAF World Championships at the London Stadium in London on August 5, 2017.
American veteran Justin Gatlin was booed after he stunned Usain Bolt to win the 100m world title in London on Saturday. (AFP)

Jamaica's Usain Bolt (C) competes in the final of the men's 100m athletics event at the 2017 IAAF World Championships at the London Stadium in London on August 5, 2017. (AFP)