Tennis hotpiece Andy Roddick posted a legs-open, ass-up photo of himself as a challenge to Serena Williams (at right), yesterday. On his Twitter page he wrote:

changed the pic only cause @serenajwilliams wanted to see her butt competition…. i have no chance

I don’t think anyone has Serena Williams beat in the ass category. GOOD GOD!

Bigger Andy Roddick photo in the jump!