Champions League: Bayern Munich ease past Red Star Belgrade 3-0
"We had the whole game under control, but we had many chances and didn't make the most of them," Lewandowski said. "In the end it was only three goals, not five or six."
Bayern failed to turn almost total possession in the first half into clear-cut scoring opportunities.
Marko Marin, Red Star's playmaker and a former German international, went closest for the visitors in a rare attack when he shot just wide of the far post before Lewandowski scored.
Even Bayern goalkeeper Manuel Neuer was off his best as he misjudged a simple back-pass and was forced to clear in the 13th.