Having held out for 90 minutes at Anfield last Monday, United conceded the quickest goal in the Premier League this season to Pedro after 30 seconds and were then ripped apart as Gary Cahill (21), Eden Hazard (62) and N'Golo Kante (70) completed the scoring.
Most of the goals stemmed from poor defending as Chelsea found ever more ingenious ways to inflict pain on Mourinho. Marcus Alonso began the unravelling with a defence-splitting pass that found Pedro, while Cahill could not believe his luck when the ball fell to him in the area after Chris Smalling failed to clear a corner.
Two up at half time, when United replaced Marouane Fellaini with Juan Mata, Chelsea sat back and waited to hit United on the break with Hazard adding a third after a clever one-two and then Kante driving into the area unopposed to score his first goal for the club.
(Reporting by Neil Robinson)
