Mike Tyson -- I'm a Big Ronda Rousey Fan!

Wanna see something funny?

Mike Tyson told us he hadn't seen the Ronda Rousey fight yet ... because he didn't have enough time!!!

Don't worry, our guy told Mike the fight was only 14 seconds ... and Mike promised he'd watch it in his car.

Mike -- who says he's a big Rousey fan -- is no stranger to quick fights ... he once knocked a guy out in 8 SECONDS.

Enjoy.