How can Maria Sharapova only be 21? It seems like she's been around for forever. Celebrating her milestone birthday, Sharapova made a guest appearance on David Letterman this past Monday night (he shares the same birthday with her).

To be blunt, the interview was pretty darn awkward -- especially the part around 2:22. What's even more disappointing, however, is how Sharapova doesn't really "save the clay" when talking about Roland Garros or the clay season. How about a little PR coaching for this one?

It would have been nice if Dave said, "wait a minute, you're not American?". The U.S. Fed Cup team sure could use her right about now (facing the Russians with no one in the top 100). Why couldn't they bring back Seles and Navratilova from retirement?