So you want to be a tennis star, but find it hard to motivate yourself to practice? Well, if you practice you might get good enough for Don Flow to let you drive one of his Audi 8's around the Bowman Gray track. Suweet!
Below is a great video of 13-year tennis pro Michael Russell being tested to see if he can pick his racket out of a bunch of very similar rackets. In one case he could tell a 1 gram difference in the weight of a test racket compared to his personal racket. Everything else - model, string tension, etc.- was similar.
For someone who plays regularly I'm a weirdly unpicky player when it comes to things like strings. Most players know exactly what kind of string they want, but I care mostly about tension. I've come across a couple of strings that I don't like but for the most part I don't pay much attention. 99% of regular players do care very much, but I've never felt my game was fine tuned enough for it to make much of a difference.
BTW, I had the chance to see Russell play in the qualifying rounds of the Winston-Salem Open two weeks ago and it was amazing to see how much steadier he was than his opponent. The guy is a hitting machine, and I was very pleased to see him put on a great show versus Andy Roddick earlier this week in a night match in Ashe Stadium at the US Open.