#2. Inviting waves of Chelsea attack
While it is hard to determine whether this was a case of Mourinho's tactics or Antonio Conte tactically outsmarting Manchester United and pinning them into their own half, Chelsea were rampant after they walked out of the dressing room after halftime.
Manchester United absorbed wave after wave of Chelsea attack and felt maybe they could pull off a defensive feat like at Anfield but Azpillecueta had other ideas. He tore open the best defence in the league with a tremendous cross finding fellow Spaniard Alvaro Morata who pulled the Blues into the lead.
United enjoyed possession quite a bit in the early and in the latter stages of the game but were pinned down in their own half for all the time in between. N'Golo Kante's return proved vital for Chelsea as he, Fabregas and Bakayoko completely nullified Man Utd's midfield and left their strikers hungry.
From there, it was just an exercise in patience for Mourinho's men who thought they could absorb all the pressure Chelsea threw at them but a loss of concentration for a breath of a second saw Morata sneak past the United defenders to head home.