Usain Bolt
2011 World Championships

Bolt went undefeated over 100 m and 200 m in the 2011 season. He began with wins in Rome and Ostrava in May. He ran his first 200 m in over a year in Oslo that June and his time of 19.86 seconds was a world-leading one. Two further 200 m wins came in Paris and Stockholm the following month, as did a 100 m in Monaco, though he was a tenth of a second slower than compatriot Asafa Powell before the world championships.

Considered the favourite to win in the 100 metres at the 2011 World Championships in Daegu, Bolt was eliminated from the final, breaking "ridiculously early" according to the starter in an interview for BBC Sport, and receiving a false start. This proved to be the highest profile disqualification for a false start since the IAAF changed the rules that previously allowed one false start per race. The disqualification caused some to question the new rule, with former world champion Kim Collins saying it was "a sad night for athletics". Usain Bolt's countryman, Yohan Blake, won in a comparatively slow 9.92 seconds.

In the World Championships 200 m, Bolt cruised through to the final which he won in a time of 19.40. Though this was short of his world record times of the two previous major tournaments, it was the fourth fastest run ever at that point, after his own records and Michael Johnson's former record, and left him three tenths of a second ahead of runner-up Walter Dix. This achievement made Bolt one of only two men to win consecutive 200 m world titles, alongside Calvin Smith. Bolt closed the championships with another gold with Jamaica in the 4 × 100 metres relay. Nesta Carter and Michael Frater joined world champions Bolt and Blake to set a world record time of 37.04.

Following the World Championships, Bolt ran 9.85 seconds for the 100 m to win in Zagreb before setting the year's best time of 9.76 seconds at the Memorial Van Damme. This run was overshadowed by Jamaican rival Blake's unexpected run of 19.26 seconds in the 200 m at the same meeting, which brought him within seven hundredths of Bolt's world record. Although Bolt failed to win the Diamond Race in a specific event, he was not beaten on the 2011 IAAF Diamond League circuit, taking three wins in each of his specialities that year.
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