#1 Bobby Lashley
I am really surprised this man is not mentioned by many fans as someone who could very easily defeat Brock Lesnar.
Bobby Lashley is the perfect candidate to defeat Brock Lesnar for the WWE Universal Championship as he is possibly the toughest superstar on the entire roster.
Lashley dominated Impact Wrestling for four years, where he was a four-time Impact World Heavyweight Champion, with at one point during one of those reigns, also simultaneously holding the Impact X-Division Championship and being the final King of The Mountain Champion.
While his booking in WWE since his return hasn't bean ideal, he is still a former two-time WWE ECW Champion, two-time Intercontinental Champion and the United States Champion.
What's most impressive about Lashley and what makes him the most legit on the roster is his MMA record, which, in truth, is far more impressive than Brock Lesnar's. As of his last fight to date in October 2016 (he still has a contract with Bellator), Lashley's MMA record is 15-2.
Not only is his win/loss record incredible, but the fact that many of his wins have been pretty dominant makes him all the more of one of WWE's toughest ever.
Whether fans would admit it or not, Lesnar vs. Lashley is a dream match and one that could easily see Lashly down Lesnar in very convincing fashion.