4. Sheamus Vs. Roman Reigns
The most obvious entry on this list, but a rivalry that is sure to dominate the early portion of 2016 at the very least. Reigns and Sheamus are set to clash in a rematch for the WWE World Heavyweight Championship at TLC, but don't expect that to be the last instalment of their feud. Whether you agree with the choice of Sheamus as WWE Champion or not, it certainly keeps Roman Reigns busy until Seth Rollins returns from injury. The question of whether the Irishman deserves the carry the title into WrestleMania is a different matter entirely, one which could see him lose the belt as early as the Royal Rumble. Either way, Reigns vs. Sheamus is a feud that deserves to be fully explored, regardless of whether or not they actually compete for the belt at WrestleMania. The story is a potentially compelling one, with the proudly independent Roman facing off against a man who sold himself to the Authority for the gold.