Ben Brereton Diaz's shift is over.

Ollie Arblaster arrives as Chris Wilder looks to protect what he has.

George Thomason needlessly fouls Romelle Donovan near halfway.

Another few seconds tick away.

Kalvin Phillips delivers again but Wrexham do their jobs defensively.

Sheffield United have another corner as they look to put this contest to bed.

Barry Horne
Former Wrexham midfielder on BBC Radio Wales

I'm trying to think, I don't think Michael Cooper has had a save to make.

Image source, Getty Images

Phil Parkinson has played his hand now. Can his team find a way back into this contest?

They have been better in the second half, but it has been a quiet night so far for Blades keeper Michael Cooper.

Issa Kabore's last act was to be dragged back by Harrison Burrows.

Somehow no free-kick was given.

Three more changes for Wrexham as George Dobson, Danny Imray and George Thomason come on for Ben Sheaf, Issa Kabore and Jacques Ekomie.

Ian Mitchelmore
BBC Sport Wales

Wrexham have certainly improved in the second half, although they are yet to have a shot on target with three-quarters of this game gone.

That will really frustrate Phil Parkinson, although at 1-0, he will know his side are still right in this one.

The Blades had three shots on target in the opening half but have not managed any in the second half either.

Wrexham found some momentum in the early stages of this second period but the home side have come back into it a little in the last few minutes.

The Red Dragons must dig deep now.

Femi Seriki and Tom Cannon are on for the home side.

Jordan Ayew and Tahith Chong - both of whom put in decent shifts - make way.

Kalvin Phillips is carded for blocking Ben Sheaf as the Wrexham midfielder tries to launch a counter.

Issa Kabore does well down the Wrexham right and the ball is eventually worked into the area, but Kieffer Moore cannot quite get a touch and the home side clear their lines.

Carl Asaba
Former Sheffield United striker on BBC Radio Sheffield

Femi Seriki would help us now because we could start attacking more down the right.

Jordan Ayew is doing well. He's growing and growing.

Barry Horne
Former Wrexham midfielder on BBC Radio Wales

Chris Wilder won't be happy it's just 1-0 after Sheffield United have dominated for so long.

Jordan Ayew tries to turn in the box but is snuffed out by the Wrexham rearguard.

Chris Wilder will be happier with the last couple of minutes, though.

Kalvin Phillips whips in the corner and Liam Kitching gets free, but his header goes straight up in the air and Wrexham clear.

The Blades have a corner as Sam Smith returns to action.

Sam Smith hobbles off with what looks like an ankle injury - but it looks like he will be OK to continue.

Sam Smith needs some treatment after a collision with Matty James.

He has been influential since coming on.