I"ve noticed a lot of weaker hitting players like to bring opened balls to the courts, well fuzzed, but kinda soft.
I get that from old farts also.
Big hitters seem to bring new balls. Most seem to use Penns. Very few like the Wilson balls, because they fly too far, fast, and high, making for short rallies.
I usually bring a new can of DunlopHDHardCourtChamps. They seem to fly a little slower than Penns and Wilsons, are heavier and when new, a little knappier, and can sustain a long rally a lot of times. Did I just describe myself as an old fart who's weak hitting?