Just how good is that thing? To me it's already one of the best serves I've ever seen in my life. The second serve is just scary -- 3-4 times today he hit 120+ second serve aces. The first serve has lots of pace with sick placement, and the past two years (at ages 20 and 21) he's led the tour in % of first serve points won. 733 Aces 136Double Faults 61%1st Serve 83%1st Serve Points Won 57%2nd Serve Points Won 75%Break Points Saved 602Service Games Played 93%Service Games Won 73%Service Points Won Call me bold, but just as a pure stroke (not taking into account how it fares it big moments, which we don't really know yet), it's comparable to the Sampras serve, IMO.