US' 23-year-old sprinter Christian Coleman won the 100m final at the World Championships in Qatar's Doha after clocking 9.76 seconds. Defending champion and fellow American Justin Gatlin came second, clocking 9.89 seconds. Meanwhile, Canada's Andre de Grasse bagged the bronze medal after finishing the race in 9.90 seconds. "It's an incredible time. I think the sky's the limit," Coleman said.