David Letterman, Billy Crystal Can't Return Maria Sharapova's Serve

Fresh off her loss to Serena Williams in the the Family Circle Cup, Maria Sharapova appeared on David Letterman last night:

Sharapova started out on the couch like other guests, but then they went outside and hit a few balls. Letterman and Billy Crystal tried, and failed, to return her serve, looking a little awkward in the process, but then Crystal put on a baseball glove and at least managed to catch one.