Not all players have power on the right side, if you want to pass the ball you throw from let side to rebote corto or Txula, or Chichak, or not pas the 11 line, it the ball goes to the 7-8-9 line you nedd to cover all the court it he has a good rebote, can throut any place.
The best training for a player is Doubles,is wat you play normaly.
For singles is to play singles, and everybody stop at hes level.