In the first meeting of the 2011 IAAF Diamond League, at the Qatar Athletic Super Grand Prix, he won the 200 m with a time of 20.06 seconds. Dix took further 200 m victories at the Eugene and London legs of the series, while Usain Bolt won the other three 200 m mid-season legs. He achieved a 100/200 sprint double at the 2011 USA Track and Field Championships, winning in the absence of Tyson Gay and Wallace Spearmon. Running in both the events at the 2011 World Championships in Athletics, he first secured the silver medal in the 100 m final – defending champion Bolt was disqualified for a false start and Dix was runner-up to another Jamaican, Yohan Blake, in a comparatively slow 10.08 seconds. In the 200-meter final Bolt beat the field but Dix was the closest to him, running 19.70 seconds to take his second silver of the tournament. He attempted to gain a third medal in the 4 × 100 metres relay final, but a mid-race collision between Darvis Patton and Britain's Harry Aikines-Aryeetey meant the American team's baton never reached Dix's final leg. At the Diamond League 200 m final at the Memorial Van Damme he ran a personal best of 19.53 seconds. Blake was even faster (19.26), however, leaving Dix in second place even as he became the fourth fastest 200 m runner of all-time and then won the league series.