mr_alleycat has a point - take a look at Michael Jordon - he appears to be quite dark. In fact, off the top of my head, most black professional athletes appear pretty dark in their photos, whether they were professionally taken or not.
So I'm assuming it just has something to do with the entertainment industry...
**Oh, sorry about the false photo of Queen Latifah, It was titled under her name originally, and you can't really see her face... and I don't really follow tennis
**