At the tennis court here I have seen two shirtless guys playing tennis.
I used to play a lot of squash and a bit of tennis. I belonged to a local multisport club that included hockey, lawn tennis, crown green bowling and squash. The club and the building dated from the eighteen hundreds. There was always a requirement when playing tennis to observe the "dress code." The juniors, many of whom were far better than the average club player, were not permitted to play on the best courts. Club tennis in this country revolves around "mixed doubles." That's why despite the tens of millions of pounds pumped into club tennis by Wimbledon, apart from Andy Murray and he trained in Spain, we're generally rubbish at it.
