FILE - In this Aug. 11, 2012 file photo, Usain Bolt, right, of Jamaica, crosses the finish line ahead of Ryan Bailey, of the United States, to win the men's 4x100-meter relay final and set a new world record with a time of 36.84 seconds during the athletics in the Olympic Park at the 2012 Summer Olympics in London. Bolt's performance in the 4x100-meter relay final capped a dominant showing in which he easily won the 100-meter dash in an Olympic-record time, then captured the 200-meter dash four days later. (AP Photo/Matt Dunham, File)

Associated Press
FILE - In this Aug. 11, 2012 file photo, Usain Bolt, right, of Jamaica, crosses the finish line ahead of Ryan Bailey, of the United States, to win the men's 4x100-meter relay final and set a new world record with a time of 36.84 seconds during the athletics in the Olympic Park at the 2012 Summer Olympics in London. Bolt's performance in the 4x100-meter relay final capped a dominant showing in which he easily won the 100-meter dash in an Olympic-record time, then captured the 200-meter dash four days later. (AP Photo/Matt Dunham, File)
FILE - In this Aug. 11, 2012 file photo, Usain Bolt, right, of Jamaica, crosses the finish line ahead of Ryan Bailey, of the United States, to win the men's 4x100-meter relay final and set a new world record with a time of 36.84 seconds during the athletics in the Olympic Park at the 2012 Summer Olympics in London. Bolt's performance in the 4x100-meter relay final capped a dominant showing in which he easily won the 100-meter dash in an Olympic-record time, then captured the 200-meter dash four days later. (AP Photo/Matt Dunham, File)
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