On 23 April 2013, Müller scored two goals and gave an assist in a 4–0 win against Barcelona in the first leg of the Champions League semi-finals at the Allianz Arena. In the return fixture, Müller scored a header as Bayern won 3–0 to hand Barcelona their biggest ever aggregate defeat in the Champions League, with a 7–0 scoreline across the two matches. Müller then went on to play an important role in Bayern's 2–1 victory over Borussia Dortmund in the final. On 1 June, Müller scored a penalty in the final of the 2012–13 DFB-Pokal. Bayern won the cup 3–2 to complete an historic treble. Müller scored 23 goals overall in the season (including all competitions), netting 13 in the Bundesliga, one in the Pokal, and an impressive eight in the Champions League, he also added one in the 2012 DFL-Supercup which Bayern won 2–1.