I don't why I said I used single point. I had CENTER point with 4-pt expansion. The girl threw up the serve and at the point where it reaches the high point of the toss, the ball stops, I focused on the ball, held focus in AI Servo Case 6, then held, shot, and panned with the ball. What was amazing is that even when the ball got that close to the other girl's head, it didn't matter, it stayed on the original subject and held lock.