Valuable away goals was the theme in Wednesday nights five Champions League qualifiers with two stand out victories on the road.
Hector Herrara got the winner for Porto against Lille on the hour mark while a sixteenth minute goal for Zenit St Petersburg put them in the driving seat for their second leg at Standard Liege.
Celtic took the lead after just six minutes against Maribor thanks to a Callum McGregor strike but then conceded eight minutes later in Slovenia.
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