#4. Aleister Black

Aleister Black would certainly be an interesting opponent for Brock Lesnar. The Dutch Destroyer has been dominating on Monday Night RAW, suffering among the least defeats in WWE over the last year. It comes as no surprise, especially given that it took over a year for him to suffer his first defeat in NXT.
He's been carrying a wave of momentum with him and it feels inevitable that he's going to reach the main event level in a matter of time. However, to push a star such as Black to the top, WWE is going to have to take their time to build him up.
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By now, he can be a credible opponent for Brock Lesnar and doesn't even need to win. As long as he has a good showing, then winning isn't as important, especially against a Superstar like Brock Lesnar.
And as we know, Brock Lesnar can have a great match whenever he wants to, so it might be up to him whether he's willing to wrestle a longer match.