Lukaku doubling United's lead
Lukaku opens the scoring in the first half
Hernandez endured a tough afternoon on his return to Old Trafford
Lukaku introduces himself to the Old Trafford faithful
Matic also made his Old Trafford debut
Substitute Martial opened his account for the season
Pogba rounded off the scoring with his first of the season
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Lukaku Nets Brace As Man Utd Thump West Ham
English Premier League Report: Manchester United v West Ham United 1
English Premier League
Result: Manchester United 4-0 West Ham United
Date: 13 August 2017
Venue: Old Trafford
Romelu Lukaku bagged a brace on his Premier League debut for Manchester United, as they thumped West Ham United 4-0 at Old Trafford.
Click through the gallery to see some of the best images for the encounter.
The Red Devils enjoyed most of the possession in the opening exchanges, while the likes of Henrikh Mkhitaryan and Lukaku had half chances.
Joe Hart came to West Ham's rescue in the 18th minute, as he rushed off his line to deny Juan Mata from close range.
The hosts eventually broke the deadlock in the 33rd minute, as Marcus Rashford played in Lukaku, who fired home a first-time effort from close range, 1-0.
David De Gea, who had a quiet half, came to United's rescue on the stroke of halftime as he produced a good save to keep out Andre Ayew's powerful strike.
Mourinho's men then doubled their lead in the 53rd minute when Lukaku bagged his second by heading home Mkhitaryan's free-kick.
West Ham nearly reduced the deficit six minutes later, but Marko Arnautovic's looping crashed off the crossbar with De Gea well beaten.
The woodwork then denied the Red Devils a third goal in the 66th minute as Rashford unleashed a curling effort that crashed against the upright.
Mourinho threw on Maroune Fellaini and Anthony Martial for the fina 15 minutes as they looked to see out the victory.
Mourinho's charges bagged a third in the 87th minute as Mkhitaryan delightfully played in Martial, who calmly slotted past Hart.
There was enough time for a fourth goal as Martial turned provider to pick out Pogba, who brilliantly curled the ball beyond Hart from 25-yards out.