It was a huge nightmare for Mourinho returning to Stamford Bridge, as Conte led side thrash Manchester united 4 solid un-replied goal.
While stand-in skipper Gary Cahill extended Chelsea advantage midway through the first half.
Eden Hazard made it 3-0 after the break with a super clinical finish,making Mourinho Stamford Bridge comeback a sour one.
And N’Golo Kante completed the scoring with his first goal for the club
Chelsea (3-4-3): Courtois; Azpilicueta, David Luiz, Cahill (c); Moses, Kante, Matic, Alonso;Pedro (Chalobah 71), DiegoCosta (Batshuayi 77), Hazard (Willian 77).
Unused subs: Begovic, Aina, Terry , Oscar.
Scorers Pedro 1, Cahill 20, Hazard 61, Kante 70
Booked Pedro 1, David Luiz 40, Alonso 65
Manchester United (4-2-3-1): De Gea; Valencia, Smalling (c), Bailly, Blind; Herrera, Fellaini (Mata h/t); Rashford, Pogba, Lingard (Martial 65); Ibrahimovic.
Unused subs: Romero, Rojo, Darmian, Carrick, Young.
Booked Bailly 29, Pogba 74