#2 Kurt Angle vs. Triple H
These two already faced off against one another in a mixed tag-team match at WrestleMania 34. However, that match wasn't really about Kurt Angle or Triple H; it was more about Ronda Rousey's in-ring debut and Stephanie McMahon being knocked down a peg or two. If WWE does decide to pit these two legends against each other, the story pretty much writes itself.
Angle's issues with The Authority are well documented and those issues could once again surface in the summer, with a match between the two deciding who controls Raw. If The Authority loses, they leave the show for good. This would be a great way of writing them off the show, because they've considerably outstayed their welcome.
Angle has shown that he still has a few matches left in the tank, and saving him for big events like Summerslam makes sense; meanwhile Triple H has it in him to carry Angle to a great match between the two.