#1 Brock Lesnar vs Seth Rollins
A future match between Brock Lesnar and Seth Rollins has been up in the air for a while now. In fact, Seth Rollins is the current favourite to win this year's Men's Royal Rumble match.
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Also, the plans for this match was reported to be nixed following the match between Rollins and Dean Ambrose at TLC PPV, but it seems that the match is again on the table.
Moreover, Brock Lesnar is rumoured to leave WWE around WrestleMania, so this might be the heads up for Rollins to win the Universal Championship from Lesnar at WM 35. Therefore, only time will tell if we'll see this rivalry getting renewed soon, till then let's see what happens at Men's Royal Rumble match.