More changes for both sides as Ross Barkley replaces Callum Hudson-Odoi for Chelsea, the Chelsea goalscorer receiving a standing ovation as he goes off.

Chesterfield's change sees Akwasi Asante on for James Kellermann.

Scott Hogan tries to inject some urgency into Birmingham's performance by spinning to lose a marker and cross into the box, but it is too close to the goalkeeper and Michael Cooper gathers the ball above his head.

George Moncur, Tom Huddlestone and Ryan Longman come on for Hull City, for Randell Williams, Richard Smallwood and Greg Docherty.

Andros Townsend replaces Anthony Gordon for Everton.

That's quite the gap in Chelsea appearances.

Lewis Baker has had plenty of loan spells, however.

Timo Werner fires well over as Chelsea look for a sixth with just under 30 minutes to go.

Unless we have late drama, Birmingham 0-0 Plymouth is also a contender for that last spot.

Heading towards extra-time as it stands.

Dafydd Pritchard
BBC Sport Wales at the Swansea.com Stadium

Image source, PA Media

It's been a busy, entertaining day of FA Cup action today and, when it comes to the matches fighting it out for the ignominy of being last on Match of the Day, this game will be right up there.

Chelsea make a couple more changes as Lewis Baker and Harvey Vale come on to replace Christian Pulisic and Andreas Christensen.

This is Baker's second appearance for Blues, eight years after making his debut.

Chesterfield also make a change as Jamie Grimes replaces Gavin Gunning.

Southampton are a man down but still creating the chances. And this is a glorious one.

James Ward-Prowse floats in a free-kick to the back post, Jack Stephens is free and should double the Saints' lead but can only head into the side netting.

A poor touch by Demarai Gray wastes a chance just as it appeared the Everton man was through on goal.

Changes afoot for Hull City.

Martin Keown
Former England defender on BBC Red Button

Image source, Reuters

Ziyech, I think he needs that if he is going to be a regular in this Chelsea team.

It's just a stroll here now for Chelsea.

Rob Green
Former England goalkeeper on BBC Radio 5 Live

Hull are hanging on now. It is all Everton with wave after wave. Demarai Gray is growing in confidence.

With half an hour to go, how long can Hull stay in the game? It has become one way traffic.

We're back under way at Huish Park.

Non-League Yeovil Town need to produce something special in the second half to deny Bournemouth a place in the fourth round.

But it's the FA Cup. You never know.

A rare chance for Birmingham with a free-kick in a central position just outside the penalty area but it is a poor effort from Gary Gardner, who tamely hits the wall.

It's all Everton at the moment. Demarai Gray plays in Anthony Gordon on the right and he drills a shot that's well saved by Nathan Baxter at his near post.

Jacob Greaves does just enough to deny Demarai Gray following great work by Andre Gomes to carry the ball into the penalty area.

Everton get the corner, but Nathan Baxter punches clear.

A blow for Plymouth as striker Ryan Hardie, who was a handful in the first half, has gone off with what appears to be a shoulder injury and on comes Niall Ennis.