Use audio icon at the top of page for live commentary from the FA Cup fourth-round replays
FT: Sheffield United 3-1 Wrexham - Ahmedhodzic for hosts, Mullen penalty levels, has penalty saved, but Sharp restores lead before Berge strike
FT: Grimsby 3-0 Luton Town - League Two side lead via Clifton, Orsi and Amos
FT: Burnley 2-1 Ipswich -Tella opens scoring but Hirst levels a minute later, before Tella scores late on
FT: Fleetwood Town 1-0 Sheffield Wednesday - Mendes Gomes breaks deadlock
Sheff Utd 0-0 Wrexham
How has he missed that?
Just how??
From a Wrexham attack, Sheffield United break clear with James McAtee and Iliman Ndiaye through on goal. It has to be the opener, just has to be, but McAtee - with Ndiaye to his left - goes for goal with just the keeper to beat and somehow puts it wide.
Terrible miss.
Sheff Utd 0-0 Wrexham
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
Mullin is the most likely to score for Wrexham, he's lively. I do like him as a centre forward.
Danilo Orsi
A second for the League Two side!
Luton missed a few chances and Grimsby make them pay as Danilo Orsi fires into the bottom corner.
Image source, Getty ImagesSheff Utd 0-0 Wrexham
The Wrexham fans are in great voice and they let off a volley of ironic cheers as Ismaila Coulibaly launches a shot well over from way out.
The first tie had a bit of everything but the FA Cup magic is yet to do its thing here.
Sheff Utd 0-0 Wrexham
No goals yet with 25 minutes on the clock but Sheffield United are putting together some nice combinations down both flanks. They win another corner which John Egan again heads goalwards but it is cleared by the Wrexham defence.
Sheff Utd 0-0 Wrexham
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
Berge sees McAtee and he takes a shot about 20-25 yards out and he takes the shot which is well wide of the post.
Them two are causing problems and linking up ever so well.
Grimsby 1-0 Luton
Luton are piling on the pressure in search of an equaliser and another good chance goes begging as Luke Berry heads over.
Fleetwood 0-0 Sheff Wed
Are Fleetwood going to regret these missed chances? Promise Omochere again with the opportunity but this time sends a header well wide of goal.
Sheff Utd 0-0 Wrexham
A nice sweeping move by Sheffield United to carve their way through the Wrexham midfield. Iliman Ndiaye bends a cross into the area but it is just ahead of James McAtee.
Fleetwood 0-0 Sheff Wed
Promise Omochere goes close again for Fleetwood but his drive strikes the woodwork with David Stockdale beaten in the Sheffield Wednesday goal.
Grimsby 1-0 Luton
Luton are looking to respond after being stunned by Grimsby with that early opener. Elijah Adebayo manages to direct a header towards goal but it is cleared by the hosts.
Sheff Utd 0-0 Wrexham
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
Mendy didn't play in the first game but he does look really lively on the left hand side, causing a lot of problems.
He looks like he's got a sweet left foot. He just needs to deliver for Dalby and Mullin who want the crosses into the box.
Image source, Getty ImagesSheff Utd 0-0 Wrexham
Wrexham have everyone back in their half as Sheffield United search for ways to get through their defensive block.
Billy Sharp, 37 years young, manages to find a rare bit of space for a shot but once again it is no trouble for the goalkeeper.
Sheff Utd 0-0 Wrexham
Sheffield United are just starting to up the pressure as John Egan rises highest to meet Ben Osborn's corner and though his header is on target it is a comfortable save for Rob Lainton in the Wrexham goal.
Sheff Utd 0-0 Wrexham
Clinton Morrison
Former Republic of Ireland striker on BBC Radio 5 Live
Wrexham have to be careful in midfield because if you give the ball away you will get punished because McAtee and Berge in midfield for Sheffield United will cause problems.
Harry Clifton (nine mins)
Hello upset.
Grimsby of League Two have the early lead against their Championship opponents as Harry Clifton meets a ball into the box and sends a left-footed effort into the back of the net.
Perfect start by the hosts.
Fleetwood 0-0 Sheff Wed
Almost the opener for the hosts as Promise Omochere gets his head to a cross but directs it wide of goal.
Sheff Utd 0-0 Wrexham
Chris Basham tries to sneak in down the right for Sheffield United but there's too much on the pass and the ball goes out of play.
Wrexham will be pretty happy with their start, however, they are matching their hosts quite well.
Image source, Getty ImagesGeorge Hirst
Well this is also quick!
An immediate response by Ipswich as George Hirst draws the League One side level.
Cracking start at Turf Moor.
Image source, Getty ImagesNathan Tella
That was quick!
Burnley just can't seem to stop scoring or winning under Vincent Kompany and they are ahead against League One Ipswich after just two minutes, Nathan Tella firing home.
Image source, Getty Images