Chael Sonnen isn’t calling Amanda Nunes a quitter per se, but he thinks she mentally checked out during her fight with Julianna Pena . Nunes (21-5 MMA, 14-2 UFC) shockingly lost her bantamweight title Saturday when she was submitted by Peña (11-4 MMA, 7-2 UFC) in the co-main event of UFC 269 in what is widely being considered as one of the greatest upsets in the promotion’s history. After controlling Peña for the majority of Round 1, Nunes started to slow down in the second round when Peña poured on the pressure. Nunes appeared to be gassed out and quickly tapped out to a rear-naked choke that hadn’t really been applied tightly just yet
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