I had the opportunity to try and return the serve of a high level D1 college player, as he was practicing his serve. I've never been on the court with someone that hits it that hard (he says his serve has been clocked at 129). AND, he's left handed. It became apparent right away that you have to have a pretty good idea of where the ball is going to go before it's hit to have any chance at all. I understand making an educated guess based on tendencies, where he's standing, and on the toss. My question is as the serve motion is in progress what are you watching? Is it the ball, the racket, something else? What are you doing in order to minimize your reaction time?