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We’ve seen a rainbow of sporty outfits at the 2011 US Open, but Danish player Caroline Wozniacki played her winning match against 2004 US Open champ Svetlana Kuznetsova in the sport’s traditional tennis whites, courtesy of her Stella McCartney for Adidas-designed dress. She also added a subtle touch of flair by matching her manicure to her pink racket. Click through for style moments from more of our favorite tennis pros!

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• Serena’s Sporty Manicure
• Rafael Nadal’s Sexy Underwear Ads
• Most Memorable US Open Looks

Serena Williams may be busy knocking out competitors in the US Open this week, but she also has manicures on her mind! “Filing nails, Watching bloomberg tv, and stock forecast. What’s happening to me? #random,” she Tweeted after one of her wins. The result: Long red tips with small golden tuxedo-like shapes painted on her ring and pointer fingers. She used two hues from her own OPI Glam Slam nail polish collection for the design—Love is a Racket fiery red with the a sheer copper Pros & Bronze on top. Williams continues to fight for the title, advancing to the quarterfinal after beating Ana Ivanovic in round four last night. Great skills and great mani—a winning combo!

Click through to see all of  Serena’s Glam Slam nail polishes for OPI! The shades are $15 for a set of two; check opi.com for salon locations.

We’re four days into the US Open, and the event’s competitors are inspiring us to give our workout wardrobes a makeover! Italian player Flavia Pennetta knocked Maria Sharapova out of the competition in a red tennis dress trimmed with teal piping by Adidas. Click through for style moments from the Williams sisters and more of our favorite tennis pros!