Jamaican sprinter Usain Bolt, regarded by most sports trackers as the fastest person ever timed, has an injured hamstring that raises some doubts about his Rio Olympics appearance. Bolt was participating in his home country’s national championships on Friday but left the competition before the 100-meter final to begin treatment on the leg, the AP reported. Bolt said he was diagnosed with a mild Grade 1 hamstring tear and that the discomfort first emerged in his quarterfinal race on Thursday night, the report said. Bolt is not yet out of the Rio Games, but his status hinges now on how he performs at a meet in London in three weeks, the AP said.
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