Many of Lesnar's WWE colleagues were in awe of his victory after so many years away from the Octagon, including Randy Orton, who will face Lesnar as an opponent at SummerSlam on Aug. 21 in Brooklyn.
Two of the WWE's top brass also had nothing but praise for Lesnar. Triple H said, "But to come back after all that time and put on that kind of performance speaks to the 'once in a lifetime' type of athlete that Brock is."
Meanwhile, Vince McMahon said, "Brock is the most formidable combat athlete in history."
Lots of other colleagues in the WWE and the world of professional wrestling also sent their congratulations on Twitter.
Brock is the man. #UFC200— Zack Ryder (@ZackRyder) July 10, 2016
Yes! Brock!— John Layfield (@JCLayfield) July 10, 2016