Mahrez, who started the confrontation on the bench before Spanish coach Josep Guardiola entered him instead of Portuguese Bernardo Silva in the 60th minute, scored the only goal of the match in the 63rd minute.
Thanks to this precious victory, the “Citizens” team raised its tally to 39 points in second place, reducing the gap with leaders Arsenal to five points.
It is City’s twelfth victory in the Premier League during the current season, compared to 3 draws and two defeats.
On the other hand, the struggling “Blues” team suffered its sixth loss this season, compared to 7 wins and 4 draws, to freeze its balance at 25 points, ranked tenth.