He can improve his approach shots, in semi and final he really did kamikaze approaches à la Roddick and got crushed.
I don't believe in approach shots any more - if by that you mean a shot specifically executed to rush the net in its wake. I don't think it's a good strategy nowadays. Right now you need to hit a shot, wait it fly over the net, consider your opponent's placement, speed and the trajectory of the ball, and then decide if going to the net is a good thing.
Because if the opponent will have enough time to prepare a passer, you're going to look stupid 8 out or 10 times at the net.