Pep Guardiola claimed he was emotionally drained and had aged 10 years after Manchester City's stunning Champions League win over Bayern Munich. City put one foot in the semi-finals for a third successive year as they powered to a 3-0 victory over the German champions in the first leg of their last-eight tie at the Etihad Stadium on Tuesday. City manager Guardiola, who reached the last four three times as Bayern boss, said: "Emotionally I'm destroyed. I have 10 more years today. It was so demanding a game. It was not comfortable. "Now I have to relax - a day off for the guys, prepare for Leicester (in the Premier League on Saturday). "After five, six minutes it was a tight game and in part of the game they were better than us. It was difficult to control them. "In the last minutes of the (halves) we were better and we scored three fantastic chances." The first half was evenly contested but City claimed the initiative with a spectacular strike from Rodri after 27 minutes. A powerful header from Bernardo Silva and Erling Haaland's 45th goal of a remarkable season wrapped up a convincing win as City stepped up the pressure in the second half.