Mark Zuckerberg is getting the ultimate stamp of approval from the world's best pound-for-pound MMA fighter ... with featherweight G.O.A.T. Alex Volkanovski giving a personal guarantee that Zuck's ability would impress even his most ardent critic.
Volkanovski joined Babcock on the "TMZ Sports" TV show (airs weekdays on FS1) ... and talked about his recent training session with the Meta CEO in Northern California.
"I guarantee you, you guys would be very surprised," Alex said of Zuck's aptitude on the mat.
Of course, we've seen Mark train in the past .