#3 Roman Reigns vs Bobby Lashley
The chance of Bobby Lashley getting his rumoured feud with Brock Lesnar seems unlikely, after the Wrestling Observer Newsletter said that those plans have been cancelled. If WWE were serious about giving Lashley such a big spot, it would be perfect to pair him against Reigns.
Lashley has improved leaps and bounds from his first run in the WWE, and has returned as a more rounded performer. He is the perfect foil for the growing legacy of the Roman Empire. Just give him a mini push right now, where he rebuilds his worth and popularity in front of the WWE Universe. After that, send him on a collision course with Roman Reigns.
Reigns will most probably be the Universal Champion, so he would want to be portrayed as a fighting champion, considering that has been one of his biggest criticisms of Brock Lesnar. Showing hints of fear in him to face the dominating Lashley would be an intriguing character arc that WWE can pursue.
These matches will be pure slugfests, as both aren't necessarily the best mat technicians. Power move after power move will keep their matches high octane and wildly entertaining. The brutality that a Reigns and Lashley contest promises is wildly exciting and this match would be a very entertaining path for WWE to go down.