Bayern Munich moved seven points clear at the top of the Bundesliga after a convincing 4-0 win at Schalke 04. A Thomas Muller header put Bayern in front before Lewandowski fired in from a tight angle as he scored for the eighth league game in a row.
Another Muller header and a long range David Alaba shot completed the win.
“I am not totally satisfied. We scored four goals but I could see that at times we could improve our possession game,” said Bayern boss Hansi Flick.
“We sometimes play too fast, sometimes too slow, sometimes with too much risk. There is lost possession which we can avoid.”
Bayern midfielder Joshua Kimmich registered three assists in the game, while keeper Manuel Neuer kept his 197th clean sheet in the Bundesliga to set a new league record.
The win helped Bayern, who are going for a ninth title in a row, extend their lead at the top of the table after second-placed RB Leipzig were beaten 3-2 by Mainz a day earlier.