#1 Baron Corbin

Baron Corbin has succeeded in taking out Roman Reigns on two separate occasions and while both his wins came from less than legitimate means, it still moved up Corbin in the pecking order of WWE. It might even be what catapults him into the title picture in 2020 and maybe even a title run of his own.
Whether that happens or not remains to be seen, but retiring Kurt Angle at WrestleMania, winning the 2019 King of the ring, and defeating Roman Reigns on two separate occasions definitely makes him worthy of being put in a title picture. Beyond all that, it moves him into the conversation as one of the best heels of the entire decade.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
Think about it! No matter what this man does, he gets hated for it and he plays it up perfectly with every chance he gets. In fact, from his droning voice to his lame one-liners, the man oozes heat and now has the record to back it up. Where it goes is anyone's guess and will depend on what the company does next, but the momentum and opportunities are there.
In the end, two wins over Roman Reigns mean something in today's WWE and it is should act as a firm indicator that the company has some pretty big plans going forward for King Corbin.