#4 Seth Rollins

Seth Rollins has been one of the most WWE performers so far in 2018, and fans would rejoice to see him back in the main event title scene on Monday nights.
Rumours did the rounds in the early stages of the Summer that Rollins was going to be the one to topple Lesnar at SummerSlam but obviously, that wasn't to be.
Rollins is currently embroiled in a program with Dolph Ziggler, and the two men will battle it out for the Intercontinental title at SummerSlam, but if Rollins loses that match, then the feud between the two men will likely be brought to an end.
Despite the fact that both men are faces, a match between Rollins and Reigns could be built with relative ease. The two men are on-screen buddies and building a feud out of simple one-upmanship, similar to Rollins' feud with Balor earlier this year, would prove fairly straightforward.