low balls

I'm having problems with this player in my school. He serves and plays most of the balls really low and is really consistent. I can usually push back his short balls back short, but I really don't have an answer for his long and middle length balls that are very low to the table. I play my forehand with topspin mostly, but I have a lot of problems imparting top spin on the ball because it's so low. Most of my balls end up in net or I hit a weak shot and he punishes me with his forehand.

Any advice on how should I cope with this?