I like this Novak Djokovic guy more and more each day. Sadly, he won't be promoted nearly enough here because, well, he's not American.
Here's some footage via The Big Lead from what appears to be the same Karaoke Show that Roger Federer appeared on earlier in this space. He may not be able to beat Pong on the court, but Novak's enthusiasm trumps Roger in the Karaoke studio. Better yet, Maria Sharapova likes it.