8. John Cena vs Rusev
WWE.comAny monster heel like Rusev that runs with a long enough streak of dominance over everyone he faces eventually runs into John Cena. The smart prediction would be for Cena to drop the title to Lesnar at Summerslam, which would leave him open to a brutal feud with the Bulgarian Brute. Especially given that he will be coming off his Superman vs Doomsday-esque encounter with Brock Lesnar, it would be easy to pitch Cena here as a battered man with an empty fuel tank, while in turn, Rusev would represent something the likes of which he has rarely dealt with before. The Lesnar excuse would also give Cena some protection to a possible loss or two and Rusev will come off looking like a beast and a serious title contender. Rusev is one of the next great monster heel champions and with sufficient building done with him already, now is the time to start making him look like he'll be World Heavyweight Championship material in the near future.