Were you at the game or following from elsewhere?
Have your say on Arsenal's performance
United fans - what did you make of your team's display?
Come back to this page on Monday to find a selection of your replies
The FA Cup third round continues on Sunday, with several Premier League teams in action:
Tamworth v Tottenham (12:30) - listen on BBC Radio 5 Live
Arsenal v Manchester United - watch live on BBC One, iPlayer, the BBC Sport website & app
Crystal Palace v Stockport - listen on BBC Radio 5 Sports Extra
Ipswich v Bristol Rovers
Newcastle v Bromley - watch live on Red Button, iPlayer, the BBC Sport website & app and listen on BBC Radio 5 Live
Southampton v Swansea (16:30)
All kick-off times 15:00 GMT unless stated
BBC Sport football expert Chris Sutton has made his predictions for all 32 FA Cup third round games and given his verdict on who will make it into round four.
For this week's matches he is up against actor and musician Billy Bob Thornton, who is a Liverpool fan.
Sutton's prediction: 1-0
Well, Manchester United have cracked it now haven't they, after that draw at Anfield?
Some of the flak I've had on social media for predicting that Liverpool would win 5-0 was extraordinary.
It seems like the bunting was out because I got a score prediction wrong, although oddly I didn't hear from anyone predicting a 2-2 draw before the game.
I suppose it shows how far Manchester United have fallen that they are celebrating draws. I remember a time when any dropped points by them was treated as a disaster.
They did play well and there was a lot of excitement about their performance, but quite rightly a lot of people pointed out that now they need to back it up.
This is a very difficult tie for them to do that. Arsenal have had a bad week and are massively missing Bukayo Saka in the final third, but I don't trust United to get a result at Emirates Stadium yet.
Billy's prediction: 2-1
After an impressive point at Liverpool in the Premier League, Manchester United travel to Arsenal in the FA Cup third round on Sunday.
Gunners fan Alex Moneypenny and United supporter Tom Mortimer join The Football News Show to discuss how Old Trafford boss Ruben Amorim's emotional intelligence could be the envy of other managers...
Watch The Football News Show on iPlayer
Image source, Getty ImagesThe FA Cup third round is well under way, with Premier League sides Everton, Fulham and Aston Villa the clubs already booking their places in the fourth-round draw with wins on Thursday and Friday.
But for other sides hoping for a healthy cup run this season, when will the draw take place?
The draw will be live on BBC One and BBC iPlayer following the conclusion of the Arsenal v Manchester United tie, which kicks off at 15:00 GMT on Sunday.
It will include 32 teams - with all third-round matches this weekend settled on the day - and the resulting ties will be played over the weekend commencing Saturday, 8 February.
Arsenal head into their second cup tie in less than a week off the back of a disappointing defeat by Newcastle in the Carabao Cup semi-final first leg, while FA Cup holders Manchester United will hope to have built some confidence following an impressive performance at Liverpool in the Premier League.
It sets up an intriguing battle at Emirates Stadium on Sunday, with a spot in the fourth round on the line.
While the two sides go head-to-head on the pitch, we asked our fan writers for each club to go head-to-head off it.
Each got to ask three questions of the other. Arsenal fan Harry Symeou from The Chronicles of a Gooner, external was asked the following by our Manchester United supporter:
How much of a priority is the FA Cup for Arsenal this season?
What are Arsenal's biggest strengths and weaknesses?
With Manchester City appearing much weaker than usual, does this campaign present Mikel Arteta with his best chance yet of winning a Premier League title?
Manchester United fan contributor Dale O'Donnell from United In Focus, external was given the following questions:
Was the performance/result at Anfield a turning point for United or will it be a false dawn?
What should Arsenal be most wary of when facing Ruben Amorim's United side?
Despite the rotten league form, given you are the holders, can United win this competition again?
Simon Stone
Chief football news reporter
There has been a lot of talk around Manchester United and the January transfer window but other than Joe Hugill being recalled from Wigan, not much action.
You suspect it will not stay that way.
It was already established United needed to sell players before they could buy. It is also well known that homegrown players are a greater benefit in Profit and Sustainability terms because they create more headroom for spending.
Head coach Ruben Amorim used his pre-Arsenal media conference to underline "we know" the club's financial position.
Amorim knows - as we all do - that he has a squad of players that do not really fit his 3-4-3 system. While he might have said he has not specifically stated publicly that he wants new players, it is safe to assume he does.
So, the big question is, can United create to space needed by offloading the likes of Casemiro, Antony and Marcus Rashford this month - or do they have to sell someone there is interest in like Kobbie Mainoo?
They were in a similar position in the summer, which is how Scott McTominay ended up at Napoli.
Nothing has happened at United so far this month. But it will.
Katie Stafford
BBC Sport journalist
Manchester United boss Ruben Amorim has been speaking to the media before Sunday's FA Cup game against Arsenal (kick-off 15:00 GMT).
Here are the key lines from his news conference:
Altay Bayindir will start in goal on Sunday, rather than regular first-choice goalkeeper Andre Onana.
Amorim said he "will put out the best team to try to win" the game because United "want to win the cup" despite being "in a difficult moment."
On the possibility of squad rotation: "I don't rotate because I want to rotate; I am not different from other coaches. Players have returned from injury and now we are rotating less."
He said in the week leading up to the draw at Liverpool he "could push them" and show the players his ideas as there was time, and that showed in the confident performance.
On his first experience of competing in the FA Cup: "I see what everybody sees. It's a really old competition with a lot of history. We know we have a really strong match. We want to win and to continue with our performance."
He said the club "need to improve recruitment" and the academy so that more players come through the pathway. Amorim added: "Our idea is always to keep the best players and the players that we build for this club. But we know the position that this club is in at this moment."
On Kobbie Mainoo, who has been rumoured with a move away from Old Trafford: "I am really happy with Kobbie - he is improving."
In response to whether Marcus Rashford will leave: "We will see. Let's focus on the game."
Amorim confirmed Mainoo and Rashford have been in training and are in contention to play on Sunday.
Follow Friday's FA Cup news conferences and the rest of the day's football news
Manchester United joined Arsenal in the race to sign Brentford attacker Bryan Mbeumo. (Mirror, external)
The Reds are also set to rival Paris St-Germain for Napoli and Georgia forward Khvitcha Kvaratskhelia, 23. (L'Equipe - in French, external)
Meanwhile, West Ham have asked to be kept informed on the availability of Marcus Rashford and would be interested in taking the 27-year-old on loan from Manchester United. (Talksport, external)
Juventus midfielder Douglas Luiz, 26, is also on the radar of Reds head coach Ruben Amorim (Mail, external)
Want more transfer stories? Read Friday's full gossip column
Image source, Manchester United FCAmad Diallo has signed a new contract to extend his stay at Manchester United until June 2030.
The 22-year-old Ivory Coast international has scored six goals, contributed seven assists and won the club's player of the month award twice so far this season.
"I am really proud to have signed this new contract," Amad said. "I have had some incredible moments with this club already but there is so much more to come. I have huge ambitions in the game and I want to achieve history at Manchester United.
"It has been a difficult season for everyone, but I fully believe that we are on the right path and the future is going to be really special. I am ready to give everything to help the team and make our supporters proud again."
United technical director Jason Wilcox said: "Everyone is delighted with Amad's development; his quality on the ball, versatility and determination makes him a key part of the future of Manchester United.
"The best years of his career are ahead of him, and we all look forward to helping Amad to reach his immense potential and achieve success at the club in the coming seasons."
