#2 The Miztourage
The Hardyz will probably need an exhibition match at SummerSlam before they move on to their next opponents. Who better to put The Hardyz over, than the Miztourage consisting of Curtis Axel and Bo Dallas? Both men are great workers, and this way, they get to compete on the SummerSlam card as well.
The Miztourage essentially performs the same function as The Singh Brothers for Jinder Mahal, where they serve in the shadows of a bigger star. A short and sweet match could really get the crowd pumped up.
If Rollins and Ambrose do win the Raw Tag Team Championships at SummerSlam (at least, things seem to point in that direction), they will need heel teams to work with, at least on television. This could be a good way to have Axel and Dallas build some chemistry as a unit.