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Whether you were at the game or following from elsewhere, we want to know what you learned.
Have your say on Man Utd's performance
What did you make of Brighton's display?
Come back on Monday for a selection of your replies
Kobbie Mainoo starts only his second game of the season for Manchester United, as Casemiro is on the bench.
Luke Shaw misses out altogether as interim boss Darren Fletcher makes three changes. The only game Shaw has missed so far this season is the EFL Cup defeat at Grimsby in August.
Mason Mount comes in, with Patrick Dorgu dropping back into a defensive role. Leny Yoro replaces Ayden Heaven, who is on the bench. Fletcher's son Tyler returns to the bench alongside twin brother Jack.
Manchester United XI: Lammens, Dalot, Yoro, Martinez, Dorgu, Ugarte, Mainoo, Mount, Bruno Fernandes, Cunha, Sesko.
Substitutes: Bayindir, Maguire, Zirkzee, Malacia, Casemiro, Heaven, J Fletcher, T Fletcher, Lacey.
Brighton boss Fabien Hurzeler makes six changes, including naming former United striker Danny Welbeck as skipper.
Brajan Gruda, Olivier Boscagli, Joel Veltman, Diego Coppola and goalkeeper Jason Steele are also included as Brighton look to beat their opponents in the FA Cup for the first time.
Brighton XI: Steele, Hinselwood, Veltman, Coppola, Boscagli, Gross, Kadioglu, Gomez, Gruda, Rutter, Welbeck.
Substitutes: Verbruggen, Dunk, Van Hecke, Watson, Kostoulas, Mitoma, Ayari, Tasker, Howell.
There are eight third-round ties in the FA Cup on Sunday - as Premier League and Championship teams enter the competition - and BBC Sport will bring you every moment.
Derby v Leeds (12:00) - BBC Radio 5 Live, BBC Radio Derby & BBC Radio Leeds
Portsmouth v Arsenal (14:00) - BBC Radio 5 Live & BBC Radio Solent
Hull v Blackburn (14:30) - BBC Radio Humberside & BBC Radio Lancashire
Norwich v Walsall (14:30) - BBC Radio 5 Sports Extra 2, BBC Radio Norfolk & BBC Radio WM
Sheff Utd v Mansfield (14:30) - BBC Radio Sheffield & BBC Radio Nottingham
Swansea v West Brom (14:30)
West Ham v QPR (14:30) - BBC Radio 5 Sports Extra and BBC Radio London
Man Utd v Brighton (16:30) - BBC Radio Manchester and BBC Radio Sussex
Kick-off times GMT
Follow all of the action and reaction here
And find out how to follow the FA Cup across the BBC this weekend here
You can also listen to today's 5 Live commentaries on most smart speakers. Just say "ask BBC Sounds to play Derby County v Leeds United" or "ask BBC Sounds to play Portsmouth v Arsenal", for instance.
Find out more about how to listen to football on BBC Sounds
Brighton have been quite erratic this season, and I have done really badly at predicting their results, but they have proved time and time again how dangerous they are.
It's a boost for United that Bruno Fernandes is fit again, but their draw with Burnley on Thursday was still a poor result.
I know United fans love it when their side proves me wrong after I predict they will lose, but I can't see them doing that on Sunday.
Sutton's prediction: 1-2
