Harry Kane scored four times as Bayern Munich thrashed Dinamo Zagreb 9-2.
Real Madrid began their defence of the trophy with a 3-1 win at home to Stuttgart.
Juventus beat PSV Eindhoven by the same scoreline.
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And Sporting were 2-nil winners at home to ten-man Lille (pr: Lil).
Among the ties tonight, Manchester City welcome Inter to the Etihad.
And Celtic play Slovan Bratislava at Parkhead.
