#2 Finn Balor
Finn Balor was the company's first ever Universal Champion, and since being forced to vacate his Universal Title on the Raw after Summerslam 2016, he is still yet to receive a rematch for the belt.
There was a lot of speculation at the back end of 2017 that Balor was set to go one-on-one with Brock Lesnar at the Royal Rumble, but further rumours suggested that Vince McMahon didn't believe he was over enough to take on Lesnar.
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The former UFC Heavyweight Champion was booked like an unstoppable beast during 2017, and in the eyes of creative, the fans may not have bought him as a legitimate challenger to Lesnar's throne. Roman Reigns, however, is a different story.
The Irishman has defeated Reigns in the past and has always been booked to look strong against him. A feud between the pair could really help Balor and re-establish him as a legitimate challenger for the Universal Title.