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 Hernandez's goal.
Januzaj got the better of him on a few occasions, but he stood firm.
His occasional positional indiscipline drew some furious gesticulating from his frothing manager on the touchline but he overcame an early booking with a wholehearted display in central midfield.
Solid and unfussy in defense, and played a major role in Chelsea's third with a thumping unmarked header.
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 halftime.
United was 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.
Started quietly but made some mesmerizing runs and set up Chelsea's second with a driven cross.
Fused smart ball-carrying with a ferocious work ethic as he continues to buy into Mourinho's vision.
Wasted a fine chance at 1-0 and his distribution and decision-making was below-par throughout. Subbed after 67 minutes.
He demonstrated again why he is such a significant part of the Chelsea puzzle. Barely put a foot wrong in the center before moving to the right flank following Mikel's introduction.
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.
David de Gea
Made a fine point-blank save on 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.
Struggled to deal with the lively Willian before an injury prematurely ended his game early in the second half.
Turned his back on Chelsea's attack in the buildup to the 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.
Looked out of sync after his layoff. Undone by a simple Eto'o shimmy in the buildup 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 Hernandez at the far post.
Covered a lot of ground but made little attacking impact. Showed a complete lack of defensive awareness when he played Eto'o onside for Chelsea's third goal.
Went AWOL on a few occasions, and looked error-prone whenever he was seriously tested.
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 defense, and failed to get close enough to Eto'o for the home side's second goal.
Provided the only ray light in the Rooney and Van Persie-less United attack. His technique, imagination and touch was a level above most of his teammates, and was 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 teammates back into the match.
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 was subbed 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.