#1 Chris Jericho
The most high-profile of Kevin Owens' betrayal of his partner was when he turned on Chris Jericho during the "Festival of Friendship" segment. Jericho and Owens had been tag team partners with the two using every which way to help each other.
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This was during The List of Jericho gimmick, where Jericho would write down the names of those that he hated. During the Festival of Friendship segment on RAW, Owens presented his own list called The List of KO and Jericho was the first name on this list after which Owens attacked Jericho.
Jericho would have his retribution as he distracted Owens during his match against Goldberg at Fastlane which resulted in him losing the Universal title.
Jericho and Owens faced off at WrestleMania 33 where Jericho lost the United States title only to win it back at the Payback PPV, before losing it on the following SmackDown Live show.