Not too odd to learn that Homer Kelley loved tennis and was into tennis before he got into golf.
Here's a couple of videos that show some relation of tennis to golf. Here's one showing the right forearm flying wedge being used in the forehand stroke of Nicolay Davydenko
Now, here's a video of Roger Federer's forehand.
Strong shots with a short backswing using a powerful pivot and using ground forces to create that powerful pivot? Sounds familiar to me.