#2 Brock Lesnar

The Brock Lesnar UFC return is a story that has been rumoured for months. His precise contractual status is still unknown but it appears likely that the former UFC Heavyweight Champion will set foot in the Octagon once again in 2019.
Lesnar, currently under contract to WWE and recognised as the WWE Universal Champion apparently has a clause in his WWE deal that will allow him to compete for UFC.
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A Heavyweight title bout with reigning champion, Daniel Cormier could well occur before WWE's Wrestlemania event in which the "Beast" could conceivably walk into the pro-wrestling spectacular as the reigning champion of both promotions.
UFC need Lesnar. Their Heavyweight division has little depth. So little in fact that they had to pit their reigning Light-Heavyweight Champion, Cormier versus then champion, Stipe Miocic such was the dearth of other deserving contenders.
Cain Velasquez hasn't competed since July 2016. Junior dos Santos has lost four of his past eight bouts and not won consecutive fights since 2011-12.
The division has no other Heavyweight drawing cards on its books. Lesnar is the man that can bring excitement and most importantly, cash to UFC's most prestigious title.
If Lesnar is not already signed and set up, the UFC need to make it happen as soon as possible.