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Tinsley achieved a personal best in the 400-meter hurdles in 2007 with a time of 48.02 seconds. He placed third at the 2010 USA Outdoor Track and Field Championships with a time of 48.46 seconds. He won the 400-meter hurdles event at the 2012 US Olympic Trials with a time of 48.33 seconds and earned a spot on the US Olympic team.
Tinsley won his first heat in the 400-meter hurdles at the Olympics in 49.13 seconds. He then won his semifinal in a season best time of 48.13 seconds. On August 6, 2012 Tinsley won silver at the 2012 London Olympics in the 400 meters hurdles, in a new personal best time of 47.91.
