Many people had an opinion on Amanda Nunes' performance at UFC 269 on Saturday. There were a lot of questions about her heart and many thought she quit against Julianna Pena. Chael Sonnen is one of those people that believe she quit during the fight.

Chael Sonnen believes this upset is very different from some of the bigger ones we've seen like Ronda Rousey against Holly Holm or even Mike Tyson and Buster Douglas. He believes it was all mental for the former two-division UFC champion.

“I can’t believe I got Peña right either,” Sonnen said about Nunes-Pena at UFC 269 (via MMAJunkie). “I got to tell you, man, that was a different fight. Like, we’ve seen upsets before. Even if you take Mike Tyson vs. Buster Douglas where Mike is trying to get up, and he just can’t beat the count or when Ronda Rousey got her head kicked into the third row, but she didn’t want it to happen. This was totally different. Amanda flicked it. That was 100 percent mental beating, zero percent physical. That submission wasn’t there.

“That was not a move. That was absolutely not a fighting technique,” Sonnen continued about Nunes-Pena. “Julianna was in a terrible position, and Amanda quit. That’s OK. Everybody goes through that at some point. I only point that out not to kick her, I point that out because that’s what the surprise was. If she got kicked like Ronda did or knocked out like Mike did, we just chalk it up to a big upset and a glorious night. To mentally check out and hand it all back in only seven minutes, a bit of a surprise.”

It may be harsh from the former UFC title challenger but its one that others share. Amanda Nunes was all class in defeat and has said she wants to rematch Julianna Pena after taking some time off.