I have seen during matches that Federer will run in from the baseline and put away a short ball with the *one handed backhand* topspin cross court shot. The ball is not necessarily very high, can be medium height around waist as well. The racquet moves very quickly and the ball travels very fast as well and dives/bounces in the middle of the court past the opponent at the net . I am interested in the mechanics of this 1HBH short ball put away: 1) grip, how hard/soft its hit 2) How hitting this from the middle of the court is different from the 1HBH topspin cross court from baseline (going by the speed of the ball, it seems to be hit equally hard but with more topspin perhaps?) 3) Any videos offering replays, slow motion or analysis of this. I couldn't find any. Thanks a lot.