My favorite shot used to be a down the line winner, either side. 3 weeks ago, playing mixed I just discovered the "nutmeg" I think they have these in soccer. It's where you hit a shot between your opponents feet. It's hard if they're prepared at all, so you have to sell hitting another...
I call my style "out of shape guy desperation tennis fu." Anything to finish as many points as soon as possible, before fatigue irretrievably sets in. I serve pretty big, have a decent 2nd serve, otherwise competent, but fitness is an issue. 3.5/4.0