Michael Johnson

Michael Norman fired another World Championships warning shot on June 25, posting a world-leading 43.56sec to win the 400m at the U.S. trials and put Tokyo disappointment further behind him.

Trayvon Bromell and Elaine Thompson-Herah grabbed 100m Diamond League victories on May 28 in Eugene, where eight world-leading performances highlighted the action at Hayward Field.

America's Bromell, the fastest man in the world last year, bounced back from a false start disqualification in Birmingham last weekend to win a star-studded men's 100m in 9.93 seconds.