Christian Coleman claimed the 100 metres world championship gold medal, taking the title of the world's fastest man from his United States team mate Justin Gatlin.
Coleman, silver medallist to Gatlin two years ago in London, turned the tables on his compatriot in Doha, rocketing to the top of the podium in a season's best time of 9.76 seconds.
The 37-year-old Gatlin continued to prove he is one of the sport's big-time performers, however, and grabbed the silver in 9.89.
Canadian Andre De Grasse, a triple medal winner at the Rio Olympics, returned to form after a string of injuries and took bronze in 9.90.
Just weeks ago American Coleman had looked in danger of missing the world championships when the US Anti-Doping Agency (USADA) filed - and later withdrew - a whereabouts violation charge that could have resulted in a one or two-year sanction.