groundstrokes: hitting the ball on the rise
How important is this?
I made a conscious effort to do this recently, and I noticed several things:
1) Against an opponent who hits soft shots, I was able to generate much more pace than if I waited for the ball to rise up, then come down
2) I had to adjust my timing, so as not to hit the ball into the net
3) I was able to hit a lot more winners.
Agassi was famous for this, right? Also, Federer?