#1 Drew McIntyre
As of this writing, it looks like Drew McIntyre will end up going one on one with Roman Reigns at WrestleMania 35, where he'll presumably lose to the "Big Dog."
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However, I wouldn't be surprised to see the former Intercontinental Champion participate in a number one contender match on the following night's Raw, and I also wouldn't be surprised to see him win that match.
If Reigns ends up beating McIntyre at WWE's biggest show of the year, then that could set up a future title match between the two if McIntyre beats Rollins for the red brand's top championship.
Even if McIntyre doesn't end up beating Rollins for Raw's main championship, a feud with Rollins would still be fantastic. Also, McIntyre is probably the top heel on WWE's red brand, so it would only make sense for him to challenge Rollins, who might be the biggest babyface in the company coming out of WrestleMania 35.