Following the Royal Rumble, Mysterio qualified for an Elimination Chamber match for the World Heavyweight Championship at the Elimination Chamber pay-per-view. In the weeks preceding the event, Mysterio began a feud with CM Punk that also involved Punk's Straight Edge Society. During the Elimination Chamber match, Mysterio eliminated Punk, but was ultimately eliminated by John Morrison. Mysterio continued to feud with Punk, costing him a Money in the Bank qualifying match and defeating SES member Luke Gallows. During the on-screen celebration of Mysterio's daughter's ninth birthday, Punk interrupted, taunting Mysterio and challenging him to a match at WrestleMania XXVI, which Mysterio later accepted. Punk later added the stipulation that if Mysterio were to lose at WrestleMania, he would be forced to join the SES. However Mysterio defeated Punk at WrestleMania. Five days later on "SmackDown", Punk challenged Mysterio to another match at Extreme Rules, with the stipulation that if Mysterio won, Punk would have his head shaved. At Extreme Rules, Mysterio lost to Punk. At Over the Limit, Mysterio faced CM Punk again with both previous stipulations in place (Mysterio's allegiance to the SES and Punk's hair). Mysterio defeated Punk, resulting in Punk's head being shaved.