Kerron Clement, of the United States, held off fast-finishing Kenyan Boniface Tumuti to win the men's Olympic 400 metres hurdles.
Day 5 guide to the action in the Moscow World Athletics Championships.
American champion Tyson Gay continued his impressive buildup to next month's World championships on Thursday by winning the 100 metres at Lausanne's Athletissima Diamond League meeting in 9.79 seconds.
Check out the gold medallists on Day 13 of the 2016 Olympic Games in Rio de Janeiro on Thursday: