#1 The Undertaker
Even a few days ago, we would never have imagined or even entertained the idea of The Undertaker challenging for a World title in 2020. He looked as though he should have retired years ago, but as it turned out - good physical health and a gimmick change were exactly what he needed.
He returned as The American Badass in the main event of night one. The Boneyard match was shot in a cinematic style and it worked perfectly for the story they were telling. It was the best Undertaker match in seven years and his change in gimmick worked perfectly.
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He beat AJ Styles in a match that saw him mix up his old gimmicks. It was refreshing to see, and since he's The Undertaker - he doesn't have any assigned brand. We see no reason why WWE shouldn't book Strowman vs The Undertaker for a big PPV.
Even if The Undertaker doesn't win, seeing him face Strowman with a new gimmick is an exciting thought.