Some people (especially older club players) have such an obsession with (tennis) balls that it gets pretty ridiculous! The other day I was working at the front desk at my club. Some older ladies came in to play a (non-USTA) league match. One of them stopped at the front desk and asked me for some balls for their match. I said that there were some (pretty new) balls in the hoppers out on the courts. This lady looked at me like I just told her to grab balls out of a garbage dumpster. She said: "Oh, no! We can't play with those! There are some boxes of balls for us in the back room." I went back there and got a few cans of balls from a box. When I gave them to her, she gave me the same look again. She said: "Oh no! These are Wilson Practice balls! We play with Pro Penn balls." I was starting to get a bit irritated. I went back and got some cans of Pro Penn balls and gave them to her. She went out to the courts to start playing, but came running back a minute later. She says: "You gave us two cans with the same number!". I'm annoyed as s***. I'm like: "Yeah, do you have a problem with that?". The lady is raging at me: "Of course! What if my ball goes onto the other court? How can we distinguish it from theirs?". It took all my self control to not say: "Exactly! If you can't distinguish them, why do you care which one you get! Besides, I assure you no matter what ball you use, you still won't be able to play worth a crap!" Since this would have probably gotten me fired, I held it back and went to get them another can. But this got me thinking, why do people care about the ball so much? For me, anything yellow, round, felty, and not completely dead is good enough. I play a lot of tournaments at a pretty decent level (4.5-5.0) and I honestly can't tell the difference between different tennis balls. Can you?