But, Rhodes -- who wasn't expected to be at the event on Wednesday -- popped up out of NOWHERE and stormed down the crowd to help out ... and when Black turned his back, Rosario jumped on his back and started trying to choke him out!!
The scuffle lasted a few moments before Black was able to wiggle her off ... but the action didn't stop there -- he got in an all-out brawl with Rhodes in the stands!!
The whole incident sets up an insanely hyped rematch between Black and Rhodes, which will go down at Arthur Ashe Stadium next week.
Badass stuff as usual from Dawson ... and we definitely need to see more of this in the future!!