#2 Undertaker/ John Cena plans
Will The Undertaker rise once again at Summerslam?
The idea is a very interesting one, especially after he defeated John Cena at WrestleMania 34 and then defeated Rusev in a Casket match at Greatest Royal Rumble, but it seems to not be a guarantee yet. Interestingly enough, another person that isn't confirmed for anything at Summerslam yet is Undertaker's opponent at WrestleMania 34, John Cena.
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According to Cagesideseats.com's WWE Rumor Roundup," There's a greater chance of The Undertaker wrestling at SummerSlam than John Cena currently. The report does not confirm whether either man will, be competing at the event. With that being said rumors about The Undertaker more likely for the event, it seems like Cena might not show up at Summerslam.
Again, there's a chance this changes and WWE brings back Cena for a marquee event, but it just hasn't happened yet. As for Undertaker, it is being rumored that he has already been pitched an idea for the event and it's apparently something that he has wanted to do for a really long time.