Here was my response three days ago to a similar question:
"One way to handle a high forehand is simply to elevate the swing of your normal forehand from a low to high swing pattern to a medium to higher swing pattern:
Handling High Balls on your Tennis Forehand at Fuzzy Yellow Balls:
http://www.youtube.com/watch?v=S5zweEQSnho
How to hit a Modern Tennis Forehand in HD / Instructional Lock and Roll Tennis:
http://www.youtube.com/watch?v=EMNtq393tvo&feature=related
Pat Dougherty, the Bollettieri Camp "Serve Doctor" also knows his stuff about forehands. As an alternative to keeping your "usual" swing path, but elevated, you can employ a "windshield wiper" forehand that will have less power, but likely more consistency. This will allow you to control your opponents powerful stroke:
Forehand Leverage, Contact Zone and Alignment to the Ball:
http://www.youtube.com/watch?v=SZqhHdmqSPQ http://www.youtube.com/watch?=SZqhHdmqSPQ
Will Hamilton of Fuzzy Yellow Balls describes how to hit a windshield wiper forehand:
Windshield Wiper Forehand Progressions
http://www.youtube.com/watch?v=PoYaPLPBCzA&feature=relmfu
So it is really useful to have both forehands at your disposal.
When your opponent is creaming the ball, you can relatively easily keep returning the ball back deep with spin by using your windshield wiper forehand.
When you have a chance to really blast a winning or forcing shot yourself, use your usual forehand, but on the high balls be sure to really load with proper rotation and weight on your right leg, then use a powerful leg push off, even getting some elevation, and just destroy that ball:
"
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