In August, Bromell arrived in Beijing for the World Championships. Bromell won his 100 metre heat in 9.91 seconds, and qualified for the final after finishing third in his semi-final in a fastest-loser time of 9.99 seconds. Bromell went on to tie for the Bronze Medal in the final, running 9.92 seconds to equal his college rival Andre De Grasse of Canada, whose 9.92 was a personal best. This was the first tie in World Championship 100m history. In the 4 × 100 metre relay, Bromell ran the lead leg once again in both the heats and the final. He was able to lead the United States team off to a victory in their heat, and a Silver Medal in the final. However, a mishap in the final exchange resulted in a disqualification for the team, stripping Bromell and his teammates of their medal. Bromell ended his season there, and went on to graduate from Baylor later in the year. He turned professional and signed an endorsement deal with sports company New Balance.