Bring them into the net by using angles and short balls. This will make them reposition. Hit to their weaker sides.
Most players lob better from the forehand side.
Hit higher lobs to them for a while. Prior to becoming Head Pro at Windemere, John played college tennis at the University of Houston and has spent 20 years teaching tennis at the Memorial Park Tennis Center, the Pasadena Racquet Club, and as the head pro at the Bay Area Racquet Club. Please do not reproduce without permission.