Pep Guardiola‘s men began on the front foot and took the lead after 23 minutes, with Mahrez finding the top right corner with a superb curling free-kick, his third goal against the London club this campaign.
Seven minutes later, Alvarez made it two from the penalty spot, finding the bottom left corner, after a VAR review spotted a Kai Havertz handball inside the box.
We were rampant and shortly before the interval, Foden added a sweet third, finishing off a free-flowing move coolly from eight yards.
Mahrez grabbed his brace shortly before full-time, converting calmly from the spot after Foden was fouled.
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The victory sees us progress into the fourth round of the competition, where we will face either Oxford United or Arsenal, who face off tomorrow evening.
View the best images from our third round win via the gallery below.