The attendance is a record of 30,278. Lewis Dunk is booked for handball as Tomas Rosicky tries to slalom through and this is top class game management from the Gunners. Brighton have hardly had the ball for three or four minutes.

Chuba Akpom on a two-on-one - he has to square it! Alexis Sanchez is in but he hesitates and is fouled instead. Wasteful from the young man. The wrong decision. But at least it uses up time.

Sanchez thinks about playing the free-kick into the corner but shoots instead, and it's a good save from David Stockdale!

Arsenal finally get hold of the ball and keep it, eating up 30 seconds of precious time. Can the Seagulls do it?

Belete Eshetea: My heart rate already increased. The magic of the FA Cup!

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One for all and all for one at the back for Arsenal now. Get it clear is the name of the day.

This game was a non-event in the first half, but credit to Brighton for this second-half showing. Arsenal are hanging on in the final minutes, which never looked likely.

Three minutes left...

Former Tottenham manager David Pleat
BBC Radio 5 live at Amex Stadium

"Calum Chambers' hand was out and the ball certainly hit it. I think Michael Oliver doesn't give it because Chambers is so close to the ball, but I would have given it. Will Brighton get one last opportunity? They should do - there is enough time."

Aaron Ramsey signals to the bench that he is injured and can't continue, but Arsenal have used all of their subs. Go and hide on the wing.

Is that a penalty?!Oooh a big call for handball against Calum Chambers but referee Michael Oliver says no. Chambers' hands were low, that would have been harsh but there are plenty like that given...

Image source, Reuters

Free-kick for the Gunners then, Alexis Sanchez to take - onto the bar! Flicked off the wall on the way, corner.

No rush from the Gunners. Brighton can't score while the ball is down there.

Into the last 10 minutes. Alexis Sanchez is a one-man counter-attack, and he wins a free-kick from a crunching tackle from Gordon Greer. Aaron Ramsey is also limping.

This is comfortably Brighton's best spell. They commit men forwards but are caught on the break and Alexis Sanchez is away! He sprints down the right before finding Chuba Akpom on the left of the box. The angle is against him but the youngster hits a decent effort, and that's well saved by David Stockdale.

Compelling viewing now as Brighton take more and more risks.

Former Tottenham manager David Pleat
BBC Radio 5 live at Amex Stadium

"Brighton are really pushing now. They have good width and are taking risks to get forward - they have to. Francis Coquelin will play in the central midfield with Mathieu Flamini. For the first time in the game Arsenal go cautious."

Two shots on target for Brighton, two goals. One more is needed.

As I expected, Mesut Ozil comes off and Francis Coquelin is on to see this one out. Outstanding last week.

Luke: Game on, the upset is back on!

Ian Pope: Fingers crossed Arsenal don't 'do a Chelsea'...

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Alexis Sanchez picks the ball up on halfway and is fouled I think four times in the same move. Brighton swarm on him, three blue and white shirts bring him to the deck. No bookings though.

Can the Seagulls mount one more attack? There is still plenty of time.

Former Tottenham manager David Pleat
BBC Radio 5 live at Amex Stadium

Image source, AP

"A very clever goal from Brighton. I don't think it's complacent from Arsenal - it is a fine pass through and Sam Baldock just steals into the space behind the Arsenal centre-backs. Baldock is sharp and alert. Wojciech Szczesny still hasn't made a save!"

Image source, Getty Images

We do have a cup tie back on our hands! Brighton have hardly had an attack all game but are somehow right back in it with a second goal! All credit to Sam Baldock too, it's a great finish from the centre-forward. He's fed on scraps all day but gets one slick pass through the middle and chips confidently over the head of Wojciech Szczesny.

Eddie: Why is Alexis Sanchez coming on now? Wrap him up in cotton wool, Wenger. The lad needs a breather!

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Mesut Ozil looks very tired now as he makes his way back from injury. He just took a touch that you or I could pull off in 5-a-side. Completely missed the ball.

I'd expect another sub shortly.