First-Person Tennis - The Real Tennis Simulator Review.

This is the current golden standard for Tennis in VR. It's a complete game and feels so real it's crazy.  There are tournaments, online mode, training and much more. You can play in non-VR, but my review is only for the VR version of the game. Hitting and volleying back and forth feels just like tennis - minus all the running and sucking that typically occurs when I play in real life. There are several movements options, teleport, slide and real tracking. With that said unless you have a huge VR area only teleport and sliding is possible. I hate paying  more than $20 for a VR game due to the limited play time I typically get out of them, however in this case it's worth it.
Here is some game play video.