The Red Devils benefited from a couple of VAR calls that resulted in ‘VARchester United’ trending during the match at Stamford Bridge.
Anthony Martial gave the visitors the lead on the stroke of half-time with a perfectly-placed header from Aaron Wan-Bissaka’s cross.
The Frenchman’s goal came after Man United centre-back Harry Maguire escaped a red card for kicking Michy Batshuayi in the groin.
VAR had no interest in the incident and Maguire went without punishment.
And VAR would cost Chelsea once again later on as they had an equaliser disallowed.
Kurt Zouma thought he had levelled the scores but his goal was chalked off as Cesar Azpilicueta was adjudged to have pushed Brandon Williams.
However, replays showed that Fred might have pushed Azpilicueta into the Manchester United left-back.
Moments later, Maguire evaded Antonio Rudiger and headed home Bruno Fernandes’ corner to make it 2-0.