However, the scoreline flattered the Red Devils as a second-half collapse from the 60th minute onwards saw the Blues concede twice in 17 seconds, confirming one of their worst opening day defeats for over 20 years.
Frank Lampard was hoping to make the perfect start at Old Trafford, but despite a dominant start, his side were unable to capitalise, and four unforced defensive errors saw his dodgy defence leak more goals.
Former Chelsea and Manchester United manager Jose Mourinho was on duty for Sky Sports, and stated that Chelsea left too much space for United to exploit: "I think they [Chelsea] were too soft, difficult to qualify them, they were not compact defensively.
"There was too much space to play in and not enough progression on the ball. They were never compact. You have to look at the distances between the defensive line, midfield, attack.
"I think United will find it much more difficult to play against teams with low defensive blocks. On Chelsea wasting possession in attacking areas. When you have dominance in ball possession you have to score goals.
Despite the defeat, Chelsea will see it as a lesson learnt. Three Premier League debuts were made, a manager who has had to make do with the resources he has. Chelsea shouldn't be written off just yet because of that result, because that overshadowed the positive signs to come from Frank Lampard's side.