This video ties in nicely to the raising tennis kids dynamic we were discussing. This girl is playing the Herr right now.
Rarely do you see someone post raw footage of a tennis dad pushing the kid verbally, the girl quits at the end. Usually You Tube footage is sanitized. And man, this little kid can wallop the ball! If you think your 9 year old can hit, this might give you a frame of reference.
Check out her very last forehand at the 3:07 mark....damn!