Not just serving, I think he played even better than he did when he beat Federer in 2010 Wimbledon. The guy gave his all, he was great at defense ( by his standard), got a lot of ball that usually would go as winners, he mentally held together unlike in other matches. Bit unfortunate that he did not grab a set in this match and certainly had a chance in third only to see Fed bombed two consective aces past him.