John Morrison, 2007Punk's debut at the summertime spectacular should have been the culmination of a months-long rivalry with John Morrison over the ECW Championship. That the two never seemed to have the in-ring chemistry one would have expected from them did not help matters. Big Show, 2010Punk was in the midst of an incredible run as the most hated man in WWE. That is, until he lost to Big Show at SummerSlam in a match that was better than expected but arguably the least meaningful on the list. At SummerSlam, the freshly turned heel would defend against familiar foes Cena and Big Show, the two Superstars he had most recently competed against at the previous two SummerSlam events.