This match was for the WWE World Championship. "SmackDown" wrestler Dean Ambrose won a match for the title at "Battleground" on July 25 against "Raw" wrestlers Roman Reigns and Seth Rollins. So "SmackDown" needed to find a challenger for Dean for "SummerSlam" and they had a six-pack challenge to find the challenger. The first five spots were given to John Cena, Bray Wyatt, AJ Styles, Baron Corbin and Dolph Ziggler. Apollo Crews took the sixth spot when he won a battle royal, but Dolph won the six-pack.