Brock Lesnar has already battled Roman Reigns and Seth Rollins, but he has yet to cross paths with Dean Ambrose. It's a shame - the unpredictable nature of Ambrose's attack and his fearless persona make him an ideal opponent for "The Beast." Of all the ex-Shield members, Ambrose might prove the most entertaining foe for Brock Lesnar. Ambrose has proven that he has no trouble rallying the crowd behind him, and that would add an interesting element to a bout with Lesnar who, face or heel, is typically cheered by fans. The intensity that Brock brings to every bout would be matched by Ambrose, and while "The Lunatic Fringe" may not be a physical match for the former WWE Champion, there's really nobody who could more convincingly give everything he had to score the upset. Whether trying desperately to tear into Lesnar in the ring or brawling with him around the arena, Dean Ambrose would put on a performance worthy of his coveted slot.