Originally Posted by dominikk1985
To me it seems like fed and nadal are not really using a classic loop. yes they have a little loop but they drop the arm (while extending it) quite slowly and then accelerate on the way up. so they are not really using gravity and the actual swing is relatively short
that is really different from the big gravity loop that gonzales uses
I do notice that straight-arm forehands like Verdasco have very sudden acceleration from the backswing to forward swing.