Originally Posted by WildVolley
There could be a number of reasons. The Fed chop shot is probably best when used against a ball that is hit with enough pace. Fed isn't generating much of his own pace, just slowing the ball and slicing it crosscourt and low.
You probably don't have Fed's eye-hand coordination, so your racket face is not at the right angle and you're not getting the racket speed through contact.
Lastly, you probably just over-estimate your own playing ability and need for practice. Change the racket face angle if you're hitting them into the net.
You maybe a genius, you know that. I did notice that Federer Chop is easier to execute when opponent hits a 80 MPH big groundie than with slow floating no pace ball. I don't know why this is ?
Here are fundamentals of slice backhand