#1. Kevin Owens

This is a feud that we need to see before Brock Lesnar retires. While he's likely years away from retiring given his schedule and physique, one Superstar that he must have a long PPV match with is Kevin Owens.
Whether he's a heel or face, Owens is always one of the most dynamic and exciting Superstars on the WWE roster. His all-round ability in the ring, on the mic, and as a character makes him a legitimate opponent for Brock Lesnar and given that both men are on RAW, it only makes sense for them to feud against each other.
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Owens just needs a solid rivalry before where he comes out strong and he could be one of Lesnar's best opponents. We've seen Lesnar work well with all sorts of superstars and if the time given is right, they can have an instant classic.
Owens himself has called for a match against Brock Lesnar at WrestleMania for a few years now. Perhaps KOMania 5? It would be a great feud at any stage of the year.
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