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David Walters, from left, Jason Lezak and Ryan Lochte dive at the start of a men's 100-meter freestyle semifinal at the U.S. Olympic swimming trials, Thursday, June 28, 2012, in Omaha, Neb. (AP Photo/Nati Harnik)

U.S. Olympic swim trials

Athletes compete for a place on the U.S. swimming team at the 2012 Olympic games in London.