At the subsequent SummerSlam pay-per-view , Punk defeated Cena to solidify his claim on the title , only to lose the title moments later to Alberto Del Rio , who opportunistically cashed in his Money in the Bank contract after Kevin Nash attacked Punk .
At the subsequent SummerSlam pay-per-view , Punk defeated Cena to solidify his claim on the title , only to lose the title moments later to Alberto Del Rio , who opportunistically cashed in his Money in the Bank contract after Kevin Nash attacked .