#4 Brock Lesnar
Brock Lesnar has retired from MMA and UFC, which only means that we will see more of him in WWE. His last appearance was his quick loss to Seth Rollins at WrestleMania 35, where he lost his Universal title.
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Lesnar is confirmed for next year's Saudi Arabia PPV, but WWE haven't announced yet whom he will face. With Goldberg set to face The Undertaker, that leaves Lesnar with Rollins and Roman Reigns, or AJ Styles, as the only big name Superstars to feud with.
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Or perhaps a match with Lars Sullivan, who could be a worthy opponent for The Beast. We could maybe see Lesnar this weekend at Money in the Bank confront and attack his opponent for the Saudi Arabia PPV.