Is there a rule on how soon a serve (or any other shot I suppose) must be called out before it's considered "in"? I was playing a contentious doubles match where my opponents were seemingly playing fast and loose when calling serves. For instance, I'd hit a serve that looked 2 feet long but the receiver's partner did not call it out and his partner blasted the return for a winner. Later, I hit another serve that was long but the receiver (same one as before) did not call it out *until* his partner had blasted the return into the net. I started noticing a pattern where the returner's partner seemed to withhold his "out" call depending on the quality of his partner's return. A while ago someone told me that you have to call the ball before you hit it, otherwise it's considered in. But this doesn't seem realistic when dealing with fast serves.