On May 2, 2015, Gatlin won the gold medal in the 4 × 100 meters relay at the World Athletics Relays in Nassau, Bahamas. It was the first defeat for Usain Bolt and Jamaica team in the 4 × 100 meters relay since 2007. The American quartet, consisting of Mike Rodgers, Tyson Gay, Ryan Bailey and Justin Gatlin, ran a time of 37.38 to win the 4 × 100 meters relay at the World Athletics Relays. On May 15, 2015, Gatlin improved his personal best to 9.74 seconds (+0.9 m/s) at the Qatar Athletic Super Grand Prix.100 Metres Result | Doha Diamond League IAAF. Retrieved August 15, 2016. His time was the fastest in the world since Yohan Blake ran 9.69 seconds in August 2012. It was the ninth-best performance in history and improved Gatlin's standing as the fifth best 100 meters athlete of all time.100 Metres – men – senior – outdoor . iaaf.org. Retrieved August 15, 2016. On May 30, Gatlin equalled his 200m personal best at the Prefontaine Classic, running 19.68, a new world lead. On June 5, 2015, Gatlin beat Usain Bolt's 100-meter 2012 Rome Diamond League record of 9.76 seconds, finishing with a time of 9.75 seconds. At the USATF Track and Field Championships, Gatlin set a new personal best in the 200 meters, running 19.57 which was the fifth fastest performance in history. On the 9th of July at the Lausanne Diamond League, Gatlin ran 9.75 once again and beat Tyson Gay and Asafa Powell by a considerable margin. In his final Diamond League before the World Championships, Gatlin ran 9.78 at the on July 17 at the Monaco Diamond League, setting the Meeting Record.
