Mahrez’s first half goal was canceled out by Josko Gvardiol as RB Leipzig got a 1-1 home draw against Manchester City.
Citeh got the lead when Gundogan set up Mahrez nicely for a 27th minute goal but Croatian defender Josko Gvardiol had other ideas as he put his team back in the encounter.
City, bidding to end their wait for a first Champions League trophy, will look to get the job done in the return leg on Tuesday, 14 March.