 Complete the following phrase:  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 100200 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 