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She's the world's No. 1 ranked tennis player - he's the greying host of The Late Show. So no prizes for guessing who won when David Letterman played Serena Williams on a hastily constructed court outside the Ed Sullivan Theatre in New York on Wednesday afternoon. The 32-year-old showed off her fabulous six-pack tummy in a black cropped top and figure-hugging white skirt with horizontal thin black lines.