Maria Sharapova has made an appearance on CBS’ Late Show last night, where David Letterman presented her with a can of tennis balls with a bow on it. World No. 3 Sharapova was in New York to celebrate her 21st birthday. If you missed the show, you still can check it out at Down the Line.

Serbian Novak Djokovic made a guest appearance yesterday on Jay Leno’s Tonight show. If you missed it, still can check it out on youtube.

Tennis’ Don Juan (aka Radek Stepanek) shows off his signature celebration and explains the origin.

Check out Roger Federer dressed up as King Arthur.