#4 Finn Balor
Unlike most other stars on this list, Finn Balor has actually been the Universal Champion, being the first holder of the gold in 2016.
Unfortunately, an injury meant that Balor would have to surrender the title after just one day, and since returning, has struggled to stay relevant near the main event.
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Receiving his re-match for the gold, albeit two years after he vacated it, was the closest the Irishman has come to the title in recent years.
So it would definitely be a huge moment for Balor to tear the title from Lesnar, perhaps busting the Demon out for their huge match.
Balor's win would definitely be an underdog story, which the company is rather desperately in need for, given recent events, as the company's resident Underdog Daniel Bryan has now turned his back on the WWE Universe.