Like to hear of little things that have a big effect in doubles play. I have a couple to mention that I have not heard mentioned. 1st one= Like when you are in the deuce ct hitting a mid ct Fh and your partner, who tends to hang in NMsL around the svc line, ends up right in line with your contact point...and he decides to make a quick move to "somewhere" right as you are swinging to contact. Not sure why they have to hang in NMsL, but at least they could stay still during your shot when they are right on the visual path of your contact point. And where the heck are they going anyway???? They have no read to go on and don't know where you are hitting yet... so where are they going in such a darned hurry as you try to focus on sweet spot contact for your shot?? Wonder how many shots are poorly hit or missed due to this, without players even knowing what happened? Hope to see SA comment if he has ever noticed this, as it interesting how the depth and speed perception is affected by movement of references in the direct background.