N'Golo Kante scored and produced a man of the match display that saw Chelsea record a 1 - 0 win over rivals Manchester United in the FA Cup on Monday night.
Before the match, Jose Mourinho claimed Antonio Conte's success at the club could be traced back to his influence at the club.
United was without the suspended Zlatan Ibrahimovic, Wayne Rooney and Anthony Martial for the match and started with Marcus Rashford upfront.
United looked to be in control of the early exchanges until Herrera was sent for with his second booking of the night.
The Spaniard was first booked for a body check on Hazard and minutes later was shown a second yellow for a cynical challenge on the Belgian.
Maroune Fellaini replaced Henrikh Mhkitaryan as Mourinho went defensive.
Kante scored the only goal of the match when he picked up a pass from Willian just outside the box and sent a low shot to the bottom of the net.
United threatended on the counter through Marcus Rashford who outwitted Gary Cahill with a nice bit of skill but not Courtious who did well to deny the Englishman.
The win sees the Blues go into the semi-final of the FA Cup where they face Tottenham Hotspurs.
In the other semi-final, Arsenal face Manchester City at Wembley.