Poor defending again from Arsenal as the free-kick is allowed to run through to Morgan Schneiderlin, who is totally unmarked, but the midfielder takes a while to shape for the shot and Francis Coquelin gets across to make a crucial block.

Image source, Getty Images

Mesut Ozil just catches Jesse Lingard and Manchester United have a free-kick in a decent position on the right flank.

First, a change for United as another United youngster, 18-year-old defender Timothy Fosu-Mensah, comes on for Marcos Rojo, who has taken a knock.

Image source, Getty Images

Marcos Rojo gets across to smash a ball aimed for Aaron Ramsey away just inside the area. That bright sun is causing some hesitancy in the Manchester United defence and Rojo screams at his team-mates for letting that almost get through.

Arsenal are pressing at the moment.

Marcus Rashford is down injured. Concern for Manchester United? No, I think he'll be alright as replays show he's taken a fair old whack in a delicate area. 

Louis van Gaal has just come out of the tunnel, his heart must have skipped a beat when he saw Rashford down injured. Amusing look of confusion on his face as his coaching staff attempt to explain where Rashford took a hit.

The first 20 minutes of this half could be tough for the Manchester United defence because the sun is wickedly bright at the moment, Daley Blind shielding his eyes as Arsenal try to build an attack.

Image source, PA

Yep, no changes for either side as Manchester United get the second half under way.

Image source, Opta

Theo Walcott had the fewest touches in that half with just 11. Petr Cech had 20. Do the Gunners need to mix things up? Doesn't look like Arsene Wenger is planning any changes as the teams emerge from the tunnel for the second half.

Trevor Sinclair
Former England winger on BBC Radio 5 live

"It's not just about the goals with Marcus Rashford. He has a cultured touch, his awareness is great and his link play is very good. Something else impressed me too; the way he went to close down Petr Cech when the Arsenal goalkeeper received a back pass. Most young players would just close down the keeper, but Rashford shut off the pass out as well, and Cech ended up giving away the ball. That tells me he has been coached properly."

Is Marcus Rashford the most clinical striker in the country at the moment? He has scored with four of his five shots on target so far in his career.

To his credit, he has not looked out of place, nor has it been that he has had a rather large rub of the green. He has made some good runs and shown good awareness to get into the right places, and finished confidently on both occasions.

Get it in the mixer! No messing about from Arsenal for their goal. Free-kick about 35 yards out, knocked into the United penalty area, Danny Welbeck (23) nodded in.

Image source, Opta

This is the question.....

Guy Mowbray
BBC Match of the Day commentator

Image source, Reuters

"When you think of all the superstars from around the world that have played in this game, it is the two men on the pitch who lived closest to this ground who have scored and made things interesting in this game. Marcus Rashford is having the week of his life, Danny Welbeck is making things interesting."

Marcus Rashford is scoring goals and keeping them out at the end as well as he clears a Mesut Ozil corner off the line.

Old Trafford roars as Marcus Rashford picks up the ball midway inside the Arsenal half, turns and races goalwards. 

He has the raw energy and enthusiasm of a greyhound and tries to nudge the ball past Laurent Koscielny, but the Arsenal man uses his experience to snuff out Rashford's run and clear.

Trevor Sinclair
Former England winger on BBC Radio 5 live

"Marcos Rojo needs to go into the changing room at half-time and apologise to his team-mates. That was pathetic defending. It's let Arsenal back in at a time when United were in cruise control."

Marcus Rashford had started just two games for under-21s this season, scoring one goal and here he is scoring twice at Old Trafford against one of Manchester United's biggest rivals.

Have the 'get him on the plane for the Euros' calls started on Twitter yet?

Back to the game, not much is happening. Arsenal are trying to work a few passes together, but they still look a bit stunned by what has happened to be honest.

Marcus Rashford has only had two touches in the Arsenal penalty area. That's all he has needed...

Image source, Opta

Rachel T: My, my, my Marcus Rashford. Wayne who?

Ashic Mahtab: This kid is freaking amazing. Double Double. Arsenal just needs 8 now to get that revenge.

Jerry Elumeze: Quick, give the lad a new long term contract!

Everyone loves this kind of Roy of the Rovers story. Well, everyone except Arsene Wenger. He is sat in his seat in the dugout, pursed lips, watching as Manchester United prepare to attack their shell shocked defence again.

The Gunners have often been accused of imploding from March onwards. Is the slide starting again?