On the women's side, in the tournaments outside the slams, they do allow coaches to come on. I'm not keen on it myself. I've seen women's matches where coaches have come on and more or less laid into their player and I'm not convinced by how helpful it is. I'm not convinced it's the best advertisement for the women's game.
The problem of allowing it during regular events and not the slams for the women must surely impact some of the young women players. Coaches have apparently only been allowed on for a couple of years, so someone who has played as long as Serena Williams for example, is well used to being on the court and working out what to do herself. Some of the younger women must surely get to rely on the coach coming on, so what happens in the slams when they can't?
I wouldn't like to see coaches come on to the court on the men's side, although the idea of Lendl coming on and having a discussion with Andy mid-match does have a certain appeal
. I just think tennis is an individual sport. Part of the skill is working out what to do and then executing that effectively. Allowing coaches on sort of devalues the individual aspect.
The only thing I would say is that we all know coaching goes on. In a lot of other sports coaches call out from the side-lines and give gestures and so on, and no one bats an eye-lash. Maybe it's time coaches were allowed to do that in tennis, call out to their player etc. That would provide something to see, but also put the onus on the player to interpret what the coach is saying and also think for themselves.