#2. Bobby Lashley/Lio Rush

Bobby Lashley and Lio Rush's partnership has been a successful one with Lashley desperately in need of a charismatic mouthpiece and Lio Rush proving more than up to the challenge of being a vocal part of Monday Night Raw week-in, week-out.
The partnership was so successful that Bobby Lashley won the Intercontinental Title twice as a result and is heading into 'The Showcase of The Immortals' as the reigning champion. Sure, he faces 'The Demon' Finn Balor, so he's almost certainly losing, but he's the champ for now.
But we've already seem some tensions in the relationship between Lashley and Rush, with Lashley turning on Rush. So, there's every chance we could see Lashley turn on Rush again. Or, perhaps more interestingly, Rush could turn on Lashley.