Sunday's swimming competition at the Olympics

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  USA's Dana Vollmer swims in the final of the women's 100-meter butterfly Sunday. Vollmer won gold and set a new world record in 55.98 seconds. Chuck Myers / MCT

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  USA's Ricky Berens competed in the semifinal heat of the men's 200 meter freestyle Sunday. Robert Gauthier / LA Times/MCT

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  Michael Phelps receives his silver medal along with his Team USA teammates for the men's 4x100 freestyle relays Sunday. Robert Gauthier / LA Times/MCT

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  Michael Phelps watches as teammate Ryan Lochte dives in for the final leg of the men's 4x100 freestyle relays Sunday. Robert Gauthier / LA Times/MCT

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  Michael Phelps looks out over the pool as teammate Nathan Adrian congratulates gold medalists Team France after the men's 4x100 freestyle relays. Robert Gauthier / LA Times/MCT

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  Team France swimmers celebrate on the pool deck as they win the men's 4x100 freestyle relays Sunday. Robert Gauthier / LA Times/MCT

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  Teammates Michael Phelps, left, and Nathan Adrian look on as Ryan Lochte falls behind French swimmer Yannick Agnel in the last leg of the men's 4x100 freestyle relays Sunday. Robert Gauthier / LA Times/MCT

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  South Africa's Cameron van der Burgh celebrates his first place finish in the men's 100-meter breaststroke Sunday. Nhat V. Meyer / MCT

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  USA's Brendan Hansen competes in the men's 100-meter breaststroke Sunday. Nhat V. Meyer / San Jose Mercury News/MCT

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  USA swimmer Brendan Hansen struts past photographers after receiving his bronze medal in the men's 100-meter breaststroke Sunday. Robert Gauthier / LA Times/MCT

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  Netherlands' Sebastiaan Verschuren pounds the water in the semifinal heat of the men's 200-meter freestyle Sunday. Brian Peterson / Minneapolis Star Tribune/MCT

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  Camille Muffat of France holds up her gold medal following her victory in the women's 400-meter freestyle Sunday. Chuck Myers / MCT