At the 2012 Summer Olympics, Felix competed in four events: 100 meters, 200 meters, 4 × 100 meters relay, and 4 × 400 meters relay, placing fifth in the 100 meters and winning gold in the other three, thus becoming the first American woman to win three golds in athletics at an Olympics since Florence Griffith-Joyner at the 1988 Summer Olympics. In her first final, the 100 meters final, she placed fifth with a personal best of 10.89 seconds. The 200 meters final, a race she lost twice at the 2004 and 2008 Summer Olympics to Jamaican rival, Veronica Campbell-Brown, proved to be her successful third attempt as she won in 21.88 seconds, outracing a stacked field that included Campbell-Brown, 2012 Olympic 100 meters champion Shelly-Ann Fraser-Pryce, 2012 Olympic 100 meters silver medalist Carmelita Jeter, and 2012 Olympic 400 meters champion Sanya Richards-Ross. Felix pushed out of the blocks with a strong start and was on par with the Jamaican athletes coming off of the curve before pulling away in the final 50 meters to clinch her long-awaited individual Olympic gold medal. Shelly-Ann Fraser-Pryce won silver and American compatriot Carmelita Jeter took the bronze medal. Felix took to the track again as part of the women's 4 × 100 meters relay team alongside Tianna Madison, Bianca Knight, and Carmelita Jeter. The foursome won with a time of 40.82 seconds, breaking the long-held world record of 41.37 seconds, set by East Germany in October 1985. On the final night of Olympic athletics, Felix ran a 48.2-second leg on the U.S. women's 4 × 400 meters relay team that included DeeDee Trotter, Francena McCorory, and Sanya Richards-Ross, winning in a time of 3:16.87, the third-fastest time in Olympic history behind the Soviet Union and the United States at the 1988 Summer Olympics, and the fifth-fastest time overall, up until that point. In the 2013 World Championships in Moscow, Felix entered in the 200 meters and was expected to also appear in the relays, but succumbed to a hamstring injury in the 200 meters final and was carried off the track by her brother. The race was won by Shelly-Ann Fraser-Pryce. 2014–15 After a nine-month layoff due to a hamstring injury, Felix resumed competition in the 400 meters at the Shanghai Diamond League meet in May 2014, in which she finished fifth with a time of 50.81 seconds. She later competed in the