Looking at the top players, if you took away their best stroke and replaced it with an average pro's stroke, would they still be top 10 players? In other words, if you took away Roddick's serve and replaced it with an average serve, what kind of player would he be? How about if you gave Federer an average forehand? I guess with Nadal it would also be the forehand and with Djokovic the backhand. Any thoughts?