Chelsea used N’Golo Kante’s goal from distance to beat 10-man Manchester United 1-0 and advance to the FA Cup semifinals on Monday night.
Ander Herrera was sent off in the first half after a pair of bookings for fouls on Eden Hazard, giving Kante the space he needed to score early in the second half.
De Gea was then called into action again to stop Gary Cahill’s half-volley following the corner.
Hazard was the danger man, and Herrera received his first yellow card for bumping him off the ball on 20 minutes.
And a second booking for Herrera followed 15 minutes later when he tripped up Hazard from behind.
Mourinho then removed Henrikh Mkhitaryan in favour of Maraoune Fellaini, who had been in line to start before Marcus Rashford made a late recovery from illness.
The Man United manager then got into a shouting match with counterpart Antonio Conte after Antonio Valencia’s challenge on Marcos Alonso.
United held on with 10 men until six minutes after half-time, when Kante got lose to score from about 22 yards.
Running on the ball to his right atop the box, Kante caught De Gea leaning the wrong way and curled his shot to the goalkeeper’s left to open the scoring.
United’s best chance at an equaliser came just before the hour mark when Rashford spun away from David Luiz at the halfway line, then turned Cahill the wrong way as he ran in on goal, only to see Thibaut Courtois save his shot.