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 Isnar match.