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Although I think he's more cute/adorable than sexy. I also like Ryan Harrison and Belucci
As far as sexy goes: Safin(duh), Andujar, and Soderling does sort of have that Daniel Craig 'I will melt you with my eyes' look about him.
On a side note, I think Federer is the sexiest dude in the world when he looks passionate and on fire in a match (case and point against Mr. Nole Birdface Mcgee yesterday). and I can't help but stare at Nadal's fat ass bouncing around the court sometimes.