Which is probably better for your mental game during the middle of a tight match? Do you let the passing shot go by you, accept it for what it is and focus on the next point? or Do you try to reach out at a tough volley, mishit or shank it, and either hit it into the net or give a 2nd opportunity,albeit and easier one, for your opponent to pass? I personally think the 2nd scenario, can really really damage your confidence. We've seen it happen to Roddick vs. Federer several times. The first scenario can make your opponent feel more confident, but I think it saves you the stress of getting down on yourself. Me personally, if I saw a passing shot hit and I knew it would take a miracle stretch for me to hit it, I just let it pass and regroup for the next point. I find that most of the time if I try to attempt those and either hit into the net or not hit a good enough volley, I get very frustrated and my concentration becomes lacking.