#1 Brock Lesnar
The "Beast" is returning to the UFC. That much seems certain. What also seems assured is that Brock Lesnar will compete for the Heavyweight Championship in his return to the company.
Lesnar has been there of course, however. Lesnar reigned as Heavyweight Champion between 2008 and 2010 when he defeated the legendary, Randy Couture to win the belt before he dropped the title in a one-sided loss to Cain Velasquez.
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Lesnar is one of the greatest draws in UFC history. His main event bouts at UFC 91, 100 and 116 and 121 all drew over one million pay per view orders. His UFC return will likely break the two million mark.
Lesnar vs anyone in the Heavyweight division would be a mouth watering proposition and with years away from the sport, but in excellent physical shape, he should be fresh and able to defeat many of the more seasoned athletes put in his path.
Do not bet against Lesnar ending 2019 as the figurehead of UFC.