Usain Bolt opened his 2012 track season with a in the 100 meters on Saturday in Kingston, Jamaica. He bettered the previous world’s best of 9.90, set by countryman and training partner Yohan Blake last week. Blake won gold at last year’s world championships after Bolt was disqualified for false starting and is one of a small handful of runners expected to challenge Bolt at the upcoming London Olympic Games. Bolt, 25, is the reigning Olympic champion and world record holder at both 100 and 200 meters.
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