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Tennis star Serena Williams appears to have a problem finding a bikini which adequately covers her butt. The muscular tennis star was photographed frolicking on the beaches of Miami with sister Venus and friends after losing in the final of the Sony Ericsson Open in Miami.

Click here to see the William sisters play tennis in style gallery.

Want more Serena? Click here to see the tennis star leaving a salon looking a hot mess.

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