U.S. swimmer Nathan Adrian

Associated Press
United States' Nathan Adrian reacts after competing in the men's 100-meter freestyle swimming semifinal at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Tuesday, July 31, 2012. (AP Photo/Daniel Ochoa De Olza)

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U.S. swimmer Nathan Adrian is the newly crowned king of the 100-meter freestyle.

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