I was affiliated with a D1 men’s tennis team for a while and got to the know the players well and watched a lot of tournament tennis and would agree there’s something to the OP’s post. It was rare to see an athlete who gave an obvious impression of being physically dominant. Lots of the male players seemed small and/or skinny and unathletic and many of the women, frankly, were pudgy. Weight-training and fitness work-outs just didn’t seem to be a big part of the training regimen and practices focused on skills, drills, tactics, and practice matches. On the court, some players with high motors chased every point like madmen and women, but many others favored cautious, low-energy styles of play that conserved strength for long multi-set matches.
From the players’ perspective, however, it was an article-of-faith that a grueling three (or five) set match was the toughest physical challenge imaginable, that the best way to prepare for it was by playing matches (not cross-training), and that no amount of fitness, strength, and size could overcome lack of skill or psychological aptitude for playing well under pressure.
Any top-tier players care to comment?