Made a fine early save from Young at 0-0 to set the tone for a tidy display although his overconfidence with a Grobelaar-style dribble on his goal-line drew the derision of Mourinho. Could do little to keep out Chicharito's goal.
Januzaj got the better of him on a few occasions, but stood firm and was a solid presence.
His occasional positional indiscipline drew some furious gesticulating from his frothing manager on the touchline but overcame an early booking with a wholehearted display in central midfield.
Solid and unfussy in defence, and played major roles in Chelsea's second and third goals, with, firstly, a driven cross and, then, a thumping unmarked header.
United were never able to take advantage of his lack of pace as Chelsea's deep defensive line, and counterattacking style, synced perfectly with the captain's advancing years.
Offered little to Chelsea's attacks but looked rock solid at left-back after being given the nod over Ashley Cole. Did just about enough to put off Welbeck with a strong challenge shortly before half-time.
Wasted a fine chance at 1-0 and his distribution and decision-making was below-par throughout. Subbed after 67 minutes.
Started quietly but made some mesmerizing runs and always a threat with the ball at his feet.
Has the energy of a labrador puppy and the teeth of a rottweiler as he demonstrated again why he is such a signficant part of the Chelsea puzzle. Barely put a foot wrong in the centre before moving to the right flank following Mikel's introduction.
Fused smart ball-carrying with a ferocious work ethic as he continues to buy into Mourinho's vision.
Fully vindicated his selection ahead of Torres by becoming the first Chelsea player to score a hat-trick against United in 60 years. Shimmied smartly past Jones to set himself up for his curled opener and followed up with two trademark poacher's strikes on an unforgettable afternoon for the Cameroon legend.
Made a fine point-blank save from Cahill with his elbow but even the Spaniard's athleticism was not enough to keep out Chelsea's three goals. No fingers could be pointed at the United No.1.
Looked out of sync after his lay-off. Undone by a simple Eto'o shimmy in the build-up to the opening goal and his positioning was frequently awry. Made a key contribution to United's consolation goal with a shot that was turned in by Chicharito at the far post.
Turned his back on Chelsea's attack in the build-up to their second goal and should have been sent off in added time as his frustration got the better of him. Stood in at left-back for most of the second half following Evra's injury.
A disastrous day for the United skipper. Red-carded in added time after stupidly hacking down Hazard. Looked ill at ease whenever Chelsea's young thrusters ran at the United defence, and failed to get close enough to Eto'o for the home side's second goal.
Went AWOL on a few occasions, and looked error-prone whenever he was seriously tested.
Struggled to deal with the lively Willian before an injury prematurely ended his game early in the second half.
Provided the only ray of light in the Rooney and Van Persie-less United attack. His technique, imagination and touch was a level above most of his team-mates, and equally at home down the middle or on the left flank.
Used the ball smoothly enough and was unfortunate for his role in Eto'o's deflected opener, but was unable to drag his team-mates back into the match.
Covered a lot of ground but made little attacking impact. Showed a complete lack of defensive awareness when he played Eto'o on-side for Chelsea's third goal.
Drew a fine early save from Cech and occasionally combined well on the left with Januzaj and Evra, but flitted in and out of the game and subbed off when United went 3-0 down.
Held the ball up well and caused problems with his movement but did not present a potent goal threat. His finishing let him down at the end of the first half when he shot straight at Cech, albeit under pressure from Azpilicueta.