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Mendy joined the Blues in September for £22 million, with Frank Lampard wanting to make a change from Kepa Arrizabalaga after a number of high profile mistakes.
The Frenchman had only made just over 60 appearances in top flight football, in Ligue 1, before making his move to England, but it's worked out pretty well.
The clean sheet against Liverpool, the fifth time Jurgen Klopp's side have lost at home in-a-row, following their record breaking undefeated streak, made him the Premier League's best ever keeper, when it comes to clean sheets.
According to the Sun, no other goalkeeper with at least 10 league appearances, from the 210 that qualify, have a better percentage of clean sheets.
The opposition have failed to score past the former Rennes keeper on 12 occasions from 22 games, giving him a 55% clean sheet record, ahead of Emiliano Martinez and Ederson's 50%.
Former Arsenal keeper Martinez has 19 clean sheets from 38, whilst Manchester City's number one has not been beaten on 67 attempts out of 135.
Another former Arsenal keeper is fourth on the list, with Alex Manninger keeping 47% of clean sheets and ex Manchester United goalie Anders Lindegaard on the same percentage.
Ederson has the most impressive record of everyone because of the amount of games involved, compared to the other four.
Whilst the Brazilian has already played over 100 games, Manninger and Martinez are on the list with just one season's worth of appearances.
No goalkeeper is without his defence and Thomas Tuchel's side certainly defended well against the defending champions on Thursday.
Jurgen Klopp's side only managed one shot on target during the game, though they were unlucky to not get one, and possibly two penalties.
N'Golo Kante somehow got away with not handing the opposition a spot kick, as he appeared to stick out his hand in the box and allow the ball to hit it.
Sadio Mane also might have won a penalty, when Andreas Christiansen looked to have fouled the former Southampton forward. His failure to go down cost his side a penalty, something Michael Owen claimed he did on purpose.