So, this happened last weekend at the Berkut Challenge:
"He made a huge impression last weekend in Chechnya at the Berkut challenge where he beat three black belts, submitting the ultra heavyweight Mauricio Cristo from Cicero Costha and deafeating multiple world and Pan champion Claudio Calasans."
There is a clear size advantage, as Calasans is not a heavyweight by any means, but he is a top flight black belt, impressive wrestler and Judoka, on top of his Jiu-Jitsu accolades.
^^ Jump to about 7:15 to watch Gui Mendes baseball choke and knee through pass his usual A+ game.
From King of the World/Wikipedia:
"Clay began taunting and provoking Liston almost immediately after the two agreed to fight. He purchased a bus and had it emblazoned with the words "Liston Must Go In Eight." On the day of the contract signing, he drove it to Liston's home in Denver, waking the champion (with the press in tow) at 3:00 a.m. shouting, "Come on out of there. I'm gonna whip you now." Liston had just moved into a white neighborhood and was furious at the attention this caused. Clay took to driving his entourage in the bus to the site in Surfside, Florida where Liston (nicknamed the "Big Bear") was training, and repeatedly called Liston the "big, ugly bear".