i think you are right on shoulder thing. euro sport commentators mentioned his serve mph was low in this match and in the match vs davydenko. otherwise very good win for novak, he should have a smooth sailing to SF.Great clutch tennis by Novak in 1st set. Showed why he is #1 and played solid tennis after that. Serve wasn't great and his groundstrokes weren't penetrating enough so maybe the shoulder is still bothering him. I love watching Novak though. Always entertaining.