For some reason, professional tennis players love imitating other professional tennis players.

Novak Djokovic does it. Andy Roddick does it. Even Caroline Wozniacki has gotten in on the fun.

During a recent exhibition against Maria Sharapova, Wozniacki pulled out what appears to be her favorite impersonation -- Serena Williams. The former No. 1 pretended to be Williams by stuffing towels in her bra and skirt to accentuate her curves.

Wozniacki even plays a point dressed as Williams, and of course she wins.

Sharapova and Wozniacki tend to have fun at their exhibitions. Earlier this year Wozniacki had her boyfriend, golf star Rory McIlroy, play a point for her against Sharapova.

If only NBA and NFL exhibitions were this much fun.

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