Manchester United hosted Chelsea at Old Trafford in their opening encounter of the 2019/20 Premier League campaign and the Red Devils got off to a flying start.
Ole Gunnar Solskjaer and Frank Lampard have been involved in this fixture a handful of times as players but they locked horns for the first time at the helm of their respective clubs.
As new signings Aaron wan-Bissaka, Harry Maguire and Daniel James made their competitive debuts for the club, the Red Devils registered a stunning 4-0 victory over a hapless Chelsea side.
Marcus Rashford put the home side ahead with an unstoppable penalty, after Kurt Zouma was adjudged to have fouled the Englishman in the penalty area.
Chelsea were left to rue their missed chances and were desperately unlucky in the first-half as they struck the post on two separate occasions.
The Blues' hopes of staging a comeback was squashed in 10 whirlwind second-half minutes as Marcus Rashford and Anthony Martial registered quick-fire goals to give the Red Devils an unassailable 3-0 lead.
Daniel James' late goal put the icing on the cake as the Red Devils registered a sensational opening day victory against a fellow top-six side.
As Manchester United got their campaign up and running with a big win against Chelsea, let's look at three reasons why they ran out 4-0 winners.
#1 Manchester United looked devastating on the counterattack
Despite not playing as well as they would have liked, Manchester United were at their counter attacking best as Chelsea had no answers to their second half brilliance.
Paul Pogba's brilliantly lofted pass put Marcus Rashford through and the Englishman finished with relative ease past the onrushing Arrizabalaga to put them 3-0 ahead in the second half.
The Red Devils registered an unassailable lead in 10 whirlwind second-half minutes, leaving Chelsea's defense scratching their heads despite their best efforts.
Although the likes of Kurt Zouma and Andres Christensen had a torrid outings, Manchester United deserve credit as their counter-attacking brilliance exposed the Blues' shortcomings at the back to devastating effect.