#4 John Cena vs. Shinsuke Nakamura (WWE Championship)
John Cena hasn't been a full-time active wrestler in the WWE for quite a while now. He pops up every now and then, wrestles a few matches, and disappears for a few months again. But to assume that he is done with the WWE is foolish. There is a very high likelihood that Cena will break Ric Flair's long standing record of 16 WWE Championship wins, and it is probably going to happen on a big stage, perhaps Summerslam.
Nakamura doesn't necessarily need to drop the title to Cena at Summerslam, but the storyline and the timing makes sense. Cena wants to break Flair's record and he hasn't surfaced since his pummeling at the hands of The Undertaker at WrestleMania 34. He's definitely going to play a role at Summerslam, so pitting him against Nakamura is a no-brainer. We've seen these two face-off before, so we know that they can work a great match.