It does look like he's got a bit of a grimace on his face. He managed to play the rest of the match and from the scoreline appeared to be O.K. so hopefully he's fine. For such a good looking guy, he can really make some ugly faces.
Ha ha... yep, that grimace on his face is not pretty. But you are right, he is a pretty good looking guy. Now lets hope he can play some good looking tennis and win a few matches, even a tournament or two.