Bayern Munich put one foot in the Champions League quarterfinals with a commanding display in a 4-1 first-leg victory at Lazio on Tuesday.

First-half goals from Robert Lewandowski, Jamal Musiala and Leroy Sane put the defending champs on the front foot. Lazio pulled a goal back in the second period but only after a Francesco Acerbi own goal minutes before.

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Bayern were off and running after just nine minutes when Lewandowski pounced and scored after a mis-hit back pass from Lazio defender Mateo Musacchio, who was replaced after just 30 minutes.

England youth Musiala added a second in the 24th when he collected a pass from Leon Goretzka and fired home from the top top the box.

The goal made Musiala -- aged 17 years and 363 days -- Bayern's youngest Champions League goal scorer, the youngest to score for a German club in the competition, and the second-youngest ever to score in a UCL knockout game after Bojan Krkic in 2008.

Bayern piled on three minutes before the half with a swift counter-attacking move that saw Sane slot home Pepe Reina's desperate parry of a powerful Kingsley Coman shot on the left.

They were 4-0 up seconds after the restart thanks to Acerbi, who bumbled the ball into his own net after a fine Sane run and cross from the left.

Lazio kept pushing and found some joy seven minutes later after some patient dribbling and a nifty finish from Joaquin Correa at the edge of the box. But it was far too little, much too late for the Serie A side as they now have a mountain to climb in the second leg in Munich on March 17.