Scott McTominay scored twice to condemn Chelsea to a 2-1 defeat at Old Trafford. The win eases the pressure on manager Erik ten Hag and turns the heat on Chelsea boss Mauricio Pochettino.
Manchester United started the game the better side, winning a penalty which David Sanchez saved before Scott McTominay's strike gave Manchester United the lead.
Chelsea stayed in the game and as the half went on grew in confidence, with Cole Palmer finishing off a brilliant strike to level it six minutes to halftime.
Blues boss Mauricio Pochettino had enough of the tentative play from his team and made changes at halftime, bringing on captain Reece James for Marc Cucurella.
That did little to swing the momentum of the game with Manchester United continuing to probe and look the dangerous side in the game.
Robert Sanchez saved a header from McTominay and Alejandro Garnacho attempted another specular bicycle kick, but unlike the game against Everton, he struck his effort wide.
The pressure ultimately paid off with Scott McTominay heading home the second goal minutes later despite hints of a push on Levi Colwill on his way.
Reece James and Armando Broja both had shots on target in an attempt to draw Chelsea back but Manchester United held on for a vital win.
Here is how we rated every Chelsea player out there today:
1. Chelsea's English midfielder #20 Cole Palmer (3R) celebrates after scoring the equalising goal with Chelsea's English midfielder #07 Raheem Sterling (R) during the English Premier League football match between Manchester United and Chelsea at Old Trafford in Manchester, north west England, on December 6, 2023. (Photo by Oli SCARFF / AFP) / RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or 'live' services. Online in-match use limited to 120 images. An additional 40 images may be used in extra time. No video emulation. Social media in-match use limited to 120 images. An additional 40 images may be used in extra time. No use in betting publications, games or single club/league/player publications. / (Photo by OLI SCARFF/AFP via Getty Images)
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2. Robert Sanchez- 7
Made save after save including the penalty save to keep Chelsea in the game in the first half. | Getty Images
3. Cole Palme-7
Brilliant finish to draw Chelsea level and for his fifth goal of the season. | AFP via Getty Images
4. Thiago Silva-5.5
Brilliant block to deny Manchester United just before United scored. Wasn't at fault for any of the goals | Getty Images