Golf is a totally different game. You hit a ball. It doesn't come back at you. You walk a little ways. Hit the ball again. It still doesn't come back at you. You might have trouble finding the ball in the woods but other than that it is one directional. Very slow paced game.
It is not always easy to tell what is happening in tennis. The ball comes at you at 120 mph - your expected to judge the lines, run, hit the ball back equally hard. There is a lot more room for error. Do people cheat yeah but I have seen guys look at the lines and shrug.
Also a lot of the mens serves in D1 are so hard that they barely change direction of they hit the top of the net.