When Agnieszka Radwanska and Caroline Wozniacki cat-napped together before their exhibition match in Hong Kong, it turned out that the pair were, in fact, disco napping. Radwanska replaced the injured Li Na in the appearance, and she and pal Wozniacki took to the court on a changeover for a little dance, the sound of it set to C+C Music Factory's "Everybody Dance Now." Here's the clip:

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Wozniacki engaged a ballboy for the dance, while Radwanska can be heard likely coaxing another to join in the entertainment. Radwanska would go on to win the match, such as it was, 6-4, 6-4.

Meanwhile, in New York City, where Serena Williams likewise defeated Victoria Azarenka in straight sets (6-4, 6-3) at the BNP Paribas Showdown on World Tennis Day, it was revealed by the Belarusian that she and the one who supplanted her atop the WTA rankings (that being Serena, of course) will trot out a duet soon enough. The song? Rihanna's "Stay." Reportedly, Azarenka will play piano while Serena sings. So stay tuned—or don't, because who knows if it will truly come to fruition?

There's more: Rafael Nadal pulled actor Ben Stiller—on hand at Madison Square Garden with wife Christine Taylor—out of the stands to play doubles with him against Juan Martin del Potro and a young girl. A young girl who proceeded to hold her own at net in exchanges with Nadal, to the delight of the nearly 16,000 people in attendance. (Madison Square Garden was said to be about 90 percent full on this Tennis Night in America.) Here's a look at that celebrity/mixed doubles match-up:

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Meanwhile, Novak Djokovic, one night after meeting his favorite Lakers, lit up Los Angeles himself with an 8-7 exhibition victory over the recovering Mardy Fish before losing alongside Pete Sampras to the greatest-ever men's doubles tandem, Bob and Mike Bryan. Tommy Haas and James Blake played earlier in the L.A. Tennis Challenge, which was not without its hiccups, with lower-level lights going out for a period of time (how Super Bowl of them) and the net being broken early on by Haas.

What was your favorite part of all the exhibition encounters last night?

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