Okay, so I've been having trouble returning short, low balls. Now these aren't drop shots, but they are just topspin strokes that, for whatever reason, bounce well inside the service box, stay quite low, and have their second bounce around the service line. The problem I've been having is that they just bounce twice so soon that I am barely able to get there, and they are perfectly disguised since I don't think even my opponent was trying to hit them. I don't know how to return these... they are too low to hit a good approach shot on, about the only thing I can do is slice it back, but sometimes I couldn't even get there in time since the topspin pulls it back down for the 2nd bounce so quickly. How to hit these [probably unintentional] "topspin drop shots" back?