2. Cesaro interferes
Cesaro faced John Cena for the US Title twice on Raw. During their first match for the US Title, Cesaro was about to make Cena tap out to the sharpshooter but Kevin Owens interfered and attacked Cesaro and gave him a pop-up powerbomb. The reason Owens gave for the attack was that he will dethrone Cena.
With Cesaro not being booked for Battleground 2015, there could be a possibility that he could end up interfering during the match and attack Kevin Owens.
It is quite possible that both Rusev and Cesaro end up interfering and this could lead to a Fatal-4 way US title match at SummerSlam!