Tennis stars Serena Williams, Roger Federer, Rafael Nadal and Maria Sharapova stopped New York City traffic yesterday, literally.

Nike set up a temporary regulation-size tennis court on Broadway and 23rd Street to unveil the sportswear company's new looks for the U.S. Open.

The Crayola box outfits included newly crowned Wimbledon champ Serena Williams in a magenta dress, Rafael Nadal pulling off taxi cab yellow and men's Wimbledon champ Roger Federer in classic red.

Cole Haan collaborator and girl about town Maria Sharapova was the pink sheep of the group in a more subdued rosy tennis dress. The tennis stars drew a crowd while mentoring young tennis players from New York Junior Tennis League, Athletes for Charity, New York City Parks Foundation and Mentoring USA.

Tennis legend John McEnroe said, "This is an exciting opportunity to bring the thrill of the US Open directly to tennis fans in New York. Providing a platform for kids to experience the beauty and power of this game and meet their tennis icons is incredible."

The U.S. Open is slated to start next week on Monday, Aug. 31.

Looking for more U.S. Open looks? Read up on tennis tournament fashion here.