Caeleb Dressel sets world record of 49.50 in men's 100m butterfly semis

Caeleb Dressel (R) of the United States celebrates after the men's 100m butterfly semifinal at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 26, 2019. Dressel set a new world record with 49.50 seconds. (Xinhua/Li Gang)