Aguero with winning penalty as Man City see off Wolves in shoot-out
Nketiah scores twice on full debut as Gunners edge past Norwich
Jesse Lingard nets two as Man Utd beat Swansea
Bristol City come from behind to hammer Crystal Palace
Bournemouth beat Middlesbrough, Leicester see off Leeds
Man City 0-0 Wolves
Manchester City have been free-scoring so far this season, but they are being left frustrated by Championship leaders Wolves so far.
An hour gone in that game.
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Lewis Keeffe: Crystal Palace cannot say league survivals an excuse. Could have made a go of the cup and still avoided relegation. Spineless.
Johnny Magrinho: I know it's not the same XI but how on Earth did Chelsea lose to Palace? Genuinely think they'd struggle in the Championship.
Callum Wilson
First appearance since January after injury and Callum Wilson tucks in a penalty for Bournemouth.
The spot-kick came after first goalscorer Jack Simpson had been hauled down in the box.
Swansea 0-2 Man Utd
Swansea finally work Sergio Romero.
Substitute Tammy Abraham tries his luck from long range but the goalkeeper tips it over the bar.
Swansea 0-2 Man Utd
John Hartson
Former Wales striker at the Liberty Stadium for BBC Radio 5 live
Swansea have not offered any threat really. They have been disappointing tonight.
Arsenal 0-1 Norwich
He has scored one and almost gets a second, but Josh Murphy lashes over with goalkeeper Matt Macey in no-man's land.
Norwich get another opportunity but Mario Vrancic drags an effort wide and doing all the hard work.
Will these missed opportunities come back to haunt them?
Image source, Getty ImagesIslam Slimani
Hosts turn it around.
Vicente Iborra plays the ball through to Kelechi Iheanacho down the left.
The Nigerian picks out fellow striker Islam Slimani for a tap-in from a yard out.
Image source, ReutersSwansea 0-2 Man Utd
Almost three for the visitors, should be three.
Swansea Kristoffer Nordfeldt makes a mess of Chris Smalling's header from a corner and the ball drops to Axel Tuanzebe in the box, but he shoots over.
Arsenal 0-1 Norwich
Ahh, come on. Hit the target lad.
Right-back Ivo Pinto puts an Arsenal defender on his backside with a smart turn in the box and finding Nelson Oliveira with his pass, but the Portuguese striker shoots over the crossbar from inside the box.
Bristol City 4-1 Crystal Palace
Alistair Bruce-Ball
BBC Radio 5 live at Ashton Gate
The Bristol City fans are loving this - huge roars of olé every time their team completes a pass and then a big comedy boo when Palace intercept.
City are heading for the quarter-finals for the first time in almost 30 years and Joe Bryan's shot basically beat Wayne Hennessey for pace before Callum O'Dowda's fourth.
Callum O'Dowda
Wow.
I know Crystal Palace have been awful in the Premier League, but they are up against Championship opposition here and are getting pummelled.
It is further shocking defending from Roy Hodgson's side, as Jairo Riedewald slices an attempted clearance and Callum O'Dowda drills in a left-footed finish from the edge of the box.
Embarrassing for the Eagles.
Image source, Rex FeaturesSwansea 0-2 Man Utd
Jesse Lingard in for his hat-trick, but scuffs a shot wide from the angle.
It was on his weaker left foot, but then he is a professional footballer.
Swansea 0-2 Man Utd
Dafydd Pritchard
BBC Sport Wales at the Liberty Stadium
This is about as comfortable as it gets for Manchester United but it appears Jose Mourinho wants to give his stars in waiting a run out.
Romelu Lukaku and Nemanja Matic could have been forgiven for lighting a cigar each on the bench, but they're getting ready to come on as substitutes.
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Jason Moore: To anyone that doesn't rate Lingard, watch him. Guy is quality, and his movement is absolutely top class.
Man City 0-0 Wolves
Back under way at Etihad Stadium.
Can Sergio Aguero get his goal??
Leicester 1-1 Leeds
No wonder Islam Slimani has his head in his hands.
The Algerian is handed a cross on a plate, but heads over the crossbar from two yards out.
It was easier to score!
Swansea 0-2 Man Utd
John Hartson
Former Wales striker at the Liberty Stadium for BBC Radio 5 live
It is a great run from Jesse Lingard, the timing of his run means he arrives at pace and that helps him power the header out of the reach of Kristoffer Nordfeldt from 16 yards.
Joe Bryan
That's broken the net!
Joe Bryan looks up from the angle of the box and smashes a left-footed drive into the roof of the net.
What a rocket and Premier League Crystal Palace are heading out of the League Cup.
Image source, Rex FeaturesJesse Lingard
A brace for the forward.
Matteo Darmian clips a ball onto the edge of the box for the onrushing Jesse Lingard, who does not break stride and heads a finish to the far post.
Image source, Rex FeaturesBristol City 2-1 Crystal Palace
It goes from bad to worse for Crystal Palace.
Lee Chung-yong, who has been lively for the visitors, is unable to carry on and is replaced by Freddie Ladapo.
Bristol City are on course to claim their third Premier League scalp in this season's Carabao Cup.