#1 Braun Strowman
The next logical choice for an opponent for Brock Lesnar after Roman Reigns is surely Braun Strowman. The monster among men is clearly very highly thought of and has enjoyed much success in his role as a fan-friendly monster in recent times.
If there is anyone to halt the beast's dominance in WWE it is surely Strowman, such is his dominance and believability it would not be a shock to see the Monster Among Men defeat Lesnar for his Universal championship. Strowman was recently victorious in the 50-man Royal Rumble match in Saudi Arabia, he possesses both the credibility and the legitimacy to defeat Lesnar and establish himself as the top guy on Raw.
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WWE may well hold out until WrestleMania for this clash, but such is Strowman's momentum and Lesnar possibly moving to the UFC soon, Strowman would be the natural successor to Lesnar and dominate on the Raw roster for the foreseeable future.