#1. Seth Rollins vs. Roman Reigns (Universal Championship)

This is a pretty obvious match to forsee. Seth Rollins and Roman Reigns are brothers. Roman Reigns beat Brock Lesnar to become the Universal Champion. He had to vacate it. The belt went back to Lesnar. Seth Rollins beat him for the title at WrestleMania. The Universal title is back on Raw on a permanent basis. Reigns wants a shot at Rollins's title. This match happens at SummerSlam. The story is right there and nobody would even need to turn heel for it. SummerSlam would be the perfect time to reintegrate the Big Dog into the world title scene, after Rollins has had a solid run with the belt.
The next few months are extremely important for the Universal title, as Rollins will look to bring back the prestige of this title. The big red belt has been nothing more than a prop for two years now, ever since Brock Lesnar took his first long break as Universal Champion. Even Reigns' title reign failed to set the world on fire. Hopefully, the Beast Slayer defends the Universal title with regularity and purpose. This match could be so much bigger than it currently is, and that is saying something. The match would also be a good one, as the chemistry between Roman and Seth would indicate.
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It would be nice to see two full-time faces going at it for a world title in the main event of SummerSlam. This is something that has not happened since 2013, when Daniel Bryan defeated John Cena to win the WWE Championship. Could we even see a Money in the Bank cash-in this time? Whether or not that happens, Seth Rollins vs. Roman Reigns for the Universal Championship is one hell of a main event for SummerSlam.
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