ATHING MU

Nigeria’s Tobi Amusan set a world record in the semifinals, then ran an even faster, wind-aided time in the final Sunday to take the gold medal in the 100-meter hurdles at world championships. The record time of 12.12 seconds came on the first race of the final evening, one of three semifinals that set up the eight-woman gold-medal race. About 90 minutes later, she ran 12.06 to beat Jamaica's Britany Anderson by 0.17.

Allyson Felix came out of a brief retirement to help the women's 4x400 relay make the final at world championships.

Allyson Felix hasn’t run her last race after all.

Allyson Felix has “no regrets” after a seventh-place finish in the 200 meters of what was likely her final Diamond League meet.

Jamaican Elaine Thompson-Herah bested her gold-medal winning time in Tokyo at the Prefontaine Classic on Saturday, and Sha’Carri Richardson finished last in her return to the track after controversy.

Sha’Carri Richardson is set to compete again after missing the Tokyo Olympics because of a positive marijuana test.

A five-minute burst of action near the backstretch of the Olympic track served up the perfect snapshot of what is going right and all that is going wrong for the U.S. track and field team in Tokyo.