It's not a surprise because anyone can see Roger can adapt to any playing condition. As successful as he is on slow courts in the past years, he would even be better with a faster courts. So given Federer playing in an era of serve and volley, he would have a field day.
NadalAgassi: I think Serena's final slam tally will be something from 18-27. My best guess is 24 or 25 though; Nole(2010) will never win Wimbledon