48.75-second leg on Team USA's victorious 4 × 400 meters relay team. 2010–11 In 2010, Felix focused on running more 400-meter races. Running the 200 meters and the 400 meters, she became the first person ever to win two IAAF Diamond League trophies in the same year. She continued her dominance by winning 21 out of 22 races, only losing to Veronica Campbell-Brown in New York. Felix also became the U.S. 100 meters champion by winning the sprint in 11.27 seconds against a strong −2.5 m/s headwind. At the 2011 World Championships in Athletics, Felix ran in the 200 and 400 meters, as well as the 4 × 100 and 4 × 400 meters relay races. In the 400-meter event, Felix's best efforts yielded only a second-place finish despite straining down the homestretch to a personal best of 49.59 seconds, 0.03 behind winner Amantle Montsho of Botswana. Montsho later tested positive for the banned stimulant methylhexaneamine in 2014. In the 200-meter final, Felix finished third in a subpar time of 22.42 seconds due to fatigue. Veronica Campbell-Brown won the gold and Carmelita Jeter won silver. In the relay events, Felix ran the second leg in both the 4 × 100 meters and 4 × 400 meters. Team USA won both events, attaining world-leading times in both finals as Felix added two world championship gold medals to her collection. The 25-year-old American sprinter was the only athlete to leave Daegu with four medals. 2012–13 In 2012, Felix returned to the Olympic trials, choosing to race the 100 meters in addition to her main event, the 200 meters. The top three finishers in each event qualify for the 2012 Summer Olympics team. In the 100 meters final, she ran 11.07 seconds, placing third, but not without controversy. Officials ruled that training partners Felix and Jeneba Tarmoh were in a dead heat for third place, the final qualification position, after initially declaring Tarmoh ahead. A run-off between Tarmoh and Felix was scheduled, but Tarmoh eventually withdrew due to emotional and physical fatigue, conceding the final 100-meter spot to Felix. In the 200 meters final at the 2012 Olympic trials, Felix recorded a personal best and a meet record of 21.69 seconds, the third-fastest time an American woman had ever run and the fourth-fastest ever clocked by a female athlete, up until that point. Carmelita Jeter and Sanya Richards-Ross placed second and third, respectively.