Medium to low pace balls give me no problem. However, recently I've started playing tennis signifantly better. Yesterday I and my hitting partner were hitting balls 80-90 mph... about 5.0-5.5 play. And most were staying in. However, I was having trouble with the one-hander in dealing with the pace. Sure I hit a sick passing shot and more but it broke down constantly. Please don't suggest slicing in this situation.