#2 The Fiend
Brock Lesnar and Bray Wyatt in the same ring were always a sight to see, however, The Fiend vs. The Beast will blow the roof off at present. Considering WWE's nonstop struggle for good TV ratings, it wouldn't be surprising if WWE decides to cash-in on this big-money feud for WrestleMania 36.
Bray Wyatt's sinister alter-ego, The Fiend, has taken pro-wrestling by storm. He is WWE's best bet to carry the color and drama of the art alive into the next decade. Wyatt also, presently, is possibly the only superstar who'd start as a favorite against Lesnar. Nobody but Wyatt can make Lesnar the underdog. And it is this aura of invincibility about these two characters that makes this feud an iconic prospect.
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Though the two superstars lead different brands, WWE has never let that become a hindrance to storytelling. So, Wyatt can easily attack Lesnar, taking him out for some time to build the foundation for a WrestleMania-worthy rivalry.