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Anthony Ervin dives off of the starting block at the start of the championship final of the Men's 50 m Freestyle during Day Seven of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center on July 1, 2012 in Omaha, Nebraska. (Photo by Al Bello/Getty Images)

U.S. Olympic swim trials

Athletes compete for a place on the U.S. London Olympic swimming team.