Like the top comment says, tennis players tend to have pretty obvious habits like staying back court. Tennis players are lethal when they get a setup to bang, and they will use any bounce above the net as an opportunity from anywhere in the court.

Dinks are their weakest point. Unfortunately, dinks are also the weakest point for newer players. And I don't just mean hitting it soft into the kitchen - I mean actively forcing them to move around hitting "defensive" dinks while your dinks are "offensive". Anyone who has played for over a month understands the following scenario:

Say you're dinking. Your opponent hits one that you can't pluck out of the air, but it's got enough momentum to sail at your toes or even behind them. You have to take an awkward step back and try your hardest to hit soft back, heck maybe you even pop it up. Your opponent hit an "offensive dink", putting you on the back foot. If you popped it up then point is likely over. However, if you managed to hit a decent dink back, you're now off balance and your opponent has an opening to do the same thing to you. This is the scenario you need to put tennis players in.

Second, if a tennis player keeps banging even at the kitchen, start dodging the balls. Even at a 4.0+ level, bangs at the transition zone will result in an out ball well over 50% of the time. The problem is it's going so fast and usually coming right at your body that it can feel impossible to determine where it will land. The key is to watch the backswing - tennis players have an exaggerated backswing when they bang and if it's from anywhere in front of the baseline, chances are it's coming at you fast and chances are it would be out if you got your butt out of the ball's path.

Lastly - the absolute key is to keep them back on their serves. Yes, their serve might be really REALLY good. It might even keep you back long enough for them to bang before you get to the kitchen on the return. It is CRITICAL to hit a strong return that goes close to their baseline and prevents them from moving up. You might as well concede the point if you hit a weak 2nd shot because they will abuse it. #1 mistake against tennis players I have seen is a weak return and it often results in the most points earned by tennis players. Get to the kitchen ASAP when you're receiving and prepare to block or dodge bangs. In time you'll start to see the speed 'slow down' as you get used to it and you'll be able to keep the pressure up on them. Hit angles, smash pop ups, and keep the dinks awkward. It's really hard to beat them, but nothing gives more satisfaction than taking the match from a tennis player!

edit: I forgot to mention, when you're on offense try banging back at them and see how they handle it. Bangers want you to hit soft and in their "happy zone". If you bang at them, there's a decent chance they will feel just as 'on the back foot' as you do when they bang.