#2. UFC 259: Jan Blachowicz vs. Israel Adesanya

Israel Adesanya took the UFC middleweight division by storm in 2018. He soon climbed up the ranks and claimed the title for himself in 2019. After dispatching Paulo Costa in October 2020, 'The Last Stylebender' showed interest in moving up a weight class. He wanted to challenge newly crowned light heavyweight champ Jan Blachowicz. The bout got scheduled for UFC 259.
Sonnen chose Adesanya to come out on top. According to him, Blachowicz had more power, but 'The Last Stylebender' was too fast and technical. Blachowicz was a huge underdog going into the fight.
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For Adesanya, a lot was at stake. His undefeated status was on the line, as well as the opportunity to become double champ. However, it did not go his way. Blachowicz out-grappled him and edged ahead on significant strikes to claim a unanimous decision victory.
#1. UFC 260: Stipe Miocic vs. Francis Ngannou 2

Stipe Miocic vs. Francis Ngannou 2 was one of the biggest heavyweight matches in UFC history. Miocic defeated Ngannou decisively in their first fight. However, the Cameroonian clawed his way back into contention, and the rematch was on.
In his official prediction, Sonnen pointed out that he had not seen any evidence that favored Ngannou. He said that much like in the first fight, the Ohio native would take Ngannou down and neutralize him. While making his prediction, Sonnen himself acknowledged the 'Chael curse.'
"My predictions have been so wrong... that people have even labeled it the Chael curse."
His prediction turned out to be wrong yet again. Ngannou was more than a match for Miocic's wrestling. He dominated and knocked out Miocic in the second round to become the new UFC Heavyweight champion.