Gold medallist Matt Grevers (C) of the U.S. poses with other medallists at the men's 100m backstroke victory ceremony during the World Swimming Championships at the Sant Jordi arena in Barcelona July 30, 2013. David Plummer of the U.S. (L) finished second in the event and took the silver medal, while France's Jeremy Stravius finished third and took the bronze. REUTERS/Albert Gea (SPAIN - Tags: SPORT SWIMMING)