You're looking at the BIGGEST TENNIS PLAYER EVER!!!
... seriously, here's Reilly Opelka -- he's 6'11" tall and he just upset John Isner (the highest ranked American male in tennis) at the Atlanta Open!!!
So, what's the best part of being a GIANT on the court?
The 21-year-old stopped to talk to TMZ Sports about the pros and cons of being Shaq-sized ... and it's super interesting.
There's definitely one big advantage on the court ... and he put it on display during the Isner match.
Opelka was the 57th ranked player in the world going into the Isner match.