Who has the best return of tennis serve?

It is hard to say, but there is no doubt in saying that 3 of the biggest servers in todays game would have to be Andy Roddick (USA), Novak Djokovic (Srb) and Chris Guccione (Aus)

Hey ya I agree.

As far as i can say its Andy Roddick..I also remember there was a match where Roddick had hit a serve and it pierced the clay court and the ball got stuck in it. Roger federer has hit 4 Aces in matches. Even again Pete Sampras.