Quickfire first-half goals from Alexis Sanchez and Jesse Lingard set Manchester United on their way to a pulsating 3-1 FA Cup fourth-round win over Arsenal at the Emirates on Friday night
United were under the cosh for most of the opening half-hour but once they took the lead, when Romelu Lukaku fed Sanchez with a perfect slide-rule pass and he rounded Petr Cech to score (31), they never looked back
Lukaku showed excellent composure again to make United's second goal two minutes later, making the most of a rapid counter-attack from the edge of the visitors' own box to spot Lingard's run into the area, from where he finished smartly
Pierre-Emerick Aubameyang pulled a goal back two minutes before the break from Aaron Ramsey's pass but, despite plenty of possession in attacking areas, Arsenal failed to threaten enough
Instead, United sealed their path into round five late on when Paul Pogba's shot was spilled and Anthony Martial netted with a powerful finish to give Ole Gunnar Solskjaer an eighth win from as many games since taking over in December
Arsenal turned the screw on the United defence from the off and overloaded them in wide areas, but the visitors' penalty area proved impenetrable as they stood up to the early barrage of pressure
Even as United began to feel their way into proceedings there was no sign of the sucker-punch which would follow for Unai Emery's men, but the quick one-two owed as much to their own defending as anything else
Three defenders raced to close down Lukaku as he feinted to shoot on the edge of the box, leaving space for Sanchez to ghost in behind and when the ball was played through to him, he rounded Cech before firing in from a tight angle for his first goal against his old club
Arsenal committed men up-field as they searched for an immediate response but, once they lost the ball, Luke Shaw found Lukaku on the half-way line and he sprinted to the edge of the Arsenal area before spotting Lingard's run, and the England midfielder took a touch inside the box before slotting home
That knocked the stuffing out of the hosts and only in the moments before half-time did they begin to improve again
 They finally put together a decent attack and Aubameyang netted with a shot he could not miss from close range after Ramsey had drifted in off the left and pulled the ball across
The striker's goal put the second half on a knife-edge but, despite long spells of possession, Arsenal could only fashion half-chances, with Alexandre Lacazette pulling a strong, but comfortable, save out of Sergio Romero
United substitute Marcus Rashford and Arsenal's Sead Kolasinac were perhaps lucky to stay on the pitch when they went head-to-head as tempers boiled over with time running out, but more concerning was a coin thrown from the crowd towards the melee of players who became involved in the aftermath
 Luckily, no-one was hurt
The visitors looked happy enough to soak up the Arsenal pressure and sprung another counter-attack late on to seal victory
 Pogba picked off a square ball across midfield and paced out of his half towards the Arsenal box before shooting from 25 yards
 Cech's save was unconvincing and provided the perfect set-up for Martial, who smashed in a third goal of the night for Solskjaer's side
Lukaku won't often pick up an MOTM award in a match where he doesn't score, but the Belgian was tasked with "taking his chance" by Solskjaer and he did not disappoint
A masterful piece of anticipation made the opening goal for Sanchez before he turned provider again moments later for Lingard
 United's path to round five could have been a lot tougher without Lukaku's assistance, and he certainly made a strong case for playing a greater part in United's upcoming games
"I'm happy because I think our work is good, but the result is bad
 Today it's the result and the injuries
 They don't help us to be in the match, maybe when the result's 1-2
 In this moment we had the possibility to grow and to win, but these injuries - especially the one to Koscielny - didn't help us because our rhythm went down
"They were very clinical today and in the moments when we attacked, we got into the box but couldn't produce the last action to score
 We deserved more but we played against Manchester United who are in their best moment of the season, and they have a lot of players to make the difference
 (Marcus) Rashford and Martial came on as well
""It was a massive step forward for us performance wise, as a team, the structure in the team was miles, miles, miles better compared to Tottenham a couple of weeks ago where we hung in there and David (De Gea) saved us
"We have been working on that, we need to dig in and defend properly against good teams
 I am not here to get excited, I am here to keep on improving the team, improving the players and just look to the next game
 It is a league game, a massive league game for us at home again
 Tomorrow we will enjoy sitting back in the chair and enjoy watching the FA Cup
"Arsenal are at home to Cardiff in the Premier League on Tuesday evening (7
45pm kick-off), while Manchester United host Burnley at Old Trafford on the same night (8pm kick-off)
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