United scored three times inside four minutes through Romelu Lukaku, Paul Pogba and Anthony Martial in the second half.
Machester United continued their perfect start to the new Premier League season when they defeated Swansea 4-0 on Saturday. The scoreline matched their opening-day destruction of West Ham United.
Manchester United netted four goals for the second consecutive week in the Premier League to rout Swansea City 4-0 on Saturday and ensure their highest-scoring start to a season for 110 years.
Eric Bailly scored just before half time to give United the lead. The Red Devils dominated the second half as they scored thrice inside four minutes through Romelu Lukaku, Paul Pogba and Anthony Martial.
Bailly slotted home in the 45th minute after Lukasz Fabianski had tipped a Pogba header onto the crossbar.
Romelu Lukaku then doubled the lead in the 80th minute with a left footed shot from the centre of the box to the bottom right corner.
Pogba the joined the fun as he put one just over Fabianski's head after Henrikh Mkhitaryan has provided him with great assist.
Two minutes latrer, an attempted Swansea attack move broke allowing United to fly forward on a quick counter-attack. Lukaku did well to out-muscle his marker before spinning and finding Pogba, who then set up Martial to cut inside and slot a great strike into the bottom right-hand corner of the net.
United, who scored twice late on to beat West Ham by the same score last weekend, have one of the strongest benches in the league and it was Martial's 75th-minute introduction that began the mayhem.
"It was 1-0 and we thought let's go for more and exploit the fragile morale of the opponent. Our bench is really good - the players have a lot to give," Mourinho said.
Martial capped the rout with a delightful strike after he picked the ball up 35 yards out, cut inside and thumped the ball past a despairing Lukasz Fabianksi.
"There was happiness in our play," Mourinho said. "There was no need to close the door."
Swansea badly missed the departed Gylfi Sigurdsson and injured Fernando Llorente and look to be in desperate need of reinforcements in the transfer window.
Despite raucous home support, Swansea seldom threatened, always struggling to deal with United's power and pace.
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