Man Utd beat Rochdale on penalties after 1-1 draw
Liverpool through, Oxford hammer West Ham
Chelsea hit seven, Sunderland beat Sheff Utd, Villa see off Brighton
Burton beat Bournemouth in game delayed three times for floodlight failure
MK Dons 0-0 Liverpool
Andy Townsend
Ex-Chelsea midfielder on BBC Radio 5 live
On MK Dons' start: I talked about keeping their shape and I think they've done that in the main and they created a really good situation that they maybe should have scored from.
Matt Green (19 mins)
Game on?!
Mariners veteran Matt Green has pulled one back for Grimsby. Always scored goals wherever he has been.
What a finish too! Route one down the middle, Chelsea let it bounce and Green thumps it in off the bar.
Image source, PA MediaMan Utd 0-0 Rochdale
Keith Hill
Bolton manager on BBC Radio 5 Live Sports Extra
Rochdale will be quite pleased with the tempo in the opening couple of minutes. I expected more pressure from Manchester United.
Oxford 0-0 West Ham
Phil McNulty
BBC Sport chief football writer at The Kassam Stadium
Oxford United have created - and missed - two big chances early on. Cameron Brannagan and Anthony Forde both should have done much better.
Bright start from Karl Robinson's side but they must take one of these chances when they have the momentum.
Man Utd 0-0 Rochdale
And under way at Old Trafford in the last of the Carabao Cup third round ties.
Oliver Sarkic (14 mins)
Could this be a shock, that wouldn't really be a shock?
Great finish from former Leeds midfielder Oliver Sarkic, who volleys in free at the far post. Burton got to the semis last year, remember.
Image source, ReutersOxford 0-0 West Ham
Oxford should really be ahead against the Premier League side West Ham.
A ball breaks loose to Cameron Brannagan 10 yards out, but the midfielder horribly scuffs his shot way wide.
MK Dons 0-0 Liverpool
Decent game! Brilliant from James Milner, twisting and turning inside the area and putting it across goal and the kid Harvey Elliott slams it against the underside of the bar!
Should have scored, should be 1-1...
Man Utd v Rochdale (20:00 BST)
Keith Hill
Bolton manager on BBC Radio 5 Live Sports Extra
I'm really excited to see (16-year-old Rochdale defender) Luke Matheson on an occasion like this. He's a brilliant, educated character. I believe this is the start of his journey.
Manchester United are a good side. Paul Pogba is a world-class player. You don't win World Cup finals without class. He's got a lot of class. He's one of the standout players in the Premier League on his day.
MK Dons 0-0 Liverpool
What a chance for MK Dons! A mistake by Dejan Lovren should be punished as the ball is cut back to Conor McGrandles, only about eight yards out, and he slams it over the top.
Should have scored!
Wolves 0-0 Reading
Reading have been on top against the Premier League side.
On-loan Lucas Boye cuts but sees his shot pushed away by Wolves back-up goalkeeper John Ruddy.
MK Dons 0-0 Liverpool
Still all Liverpool, as you'd probably expect. Adam Lallana is playing in the deep midfield role normally filled by Fabinho, by the way. He was meant to play there on the pre-season trip to America but was injured...
Man Utd v Rochdale (20:00 BST)
Simon Stone
BBC Sport at Old Trafford
Manchester United might be at a low ebb right now but Rochdale winning at Old Trafford would still be a monumental upset.
The last team from outside the top two divisions to win here in this competition was York City, who famously won the first leg of a second round tie 3-0 against a United side containing David Beckham and Ryan Giggs.
Max Power
Max Power by name, power by nature.
A corner is cleared 30 yards out from goal, Power takes a touches and rockets a thunderous shot into the top corner.
What a strike from the Sunderland man!
Image source, PA MediaOxford 0-0 West Ham
Phil McNulty
BBC Sport chief football writer at The Kassam Stadium
Nathan Holland is making his first start for West Ham United here at Oxford United and has been a bright spark early on.
The 21-year-old showed good pace to get away on the left for a cross that needed a crucial clearance by Rob Dickie and has shown some nice touches.
MK Dons 0-0 Liverpool
Andy Townsend
Ex-Chelsea midfielder on BBC Radio 5 live
Paul Tisdale will have said don't get too upset or frustrated if Liverpool start to dominate the ball and try to stay in the game. That's the key, stay in the game.
Michy Batshuayi (7 mins)
No messing from Chelsea - who double their lead already! It helps when you have a European-class striker with a point to prove. Michy Batshuayi has his first Chelsea goal for 20 months, spinning inside the area and lashing home left-footed.
Image source, Getty ImagesSheffield Utd 0-0 Sunderland
Lovely play from Sheffield United winger Callum Robinson, cutting in from the left before curling a low right-footed strike which Sunderland goalkeeper Lee Burge pushes away.
Oxford 0-0 West Ham
West Ham debutant Nathan Holland has had some early touches of the ball with the Hammers playing keep-ball at MK Dons.
You would expect that to continue for the Premier League side against their League One hosts.
Ross Barkley (4 mins)
Quite the start for Chelsea and it's Ross Barkley who finds a way through a packed Grimsby defence. It's direct too, he runs at the defence, powers into the penalty area and then crashes in at the near post.
Image source, Rex Features