A scrappy start to this last frame. It remains 0-21.

A bit loose from Mark Williams. He is on to 21, runs into a dead end and sends the cue ball into the baulk area. 0-21

Into the last frame of session one...

Watch as Mark Williams treats himself to a picnic of an audience member's sweets during the World Championship final at the Crucible.

The sugar is doing no harm to Williams' game as he leads 5-2 with one frame left in the opening session.

Steve Davis
Six-time world champion on BBC Two

This is massive. It always feels like the last frame of a session is worth double.

Scores of 46 and then 52 bring John Higgins to 5-2 behind. That is a break of at least 52 in each of the past four frames. We are moving along nicely, and we have one frame left of this opening session.

It is either going to be 3-5 or 2-6 at the end of it.

Robert T Bruce: John Higgins needs to make a come back or mark Williams will run away with it. Higgins has done it before he can do it again.

But some head-shaking from Higgins as the cue ball bounces off the cushion at pace, leaving the cue ball out of position and what looked a frame-winning position comes to a juddering halt at 46, with Williams yet to score in this seventh frame.

The last three frames have seen runs of 55, 119 and 95. Now Higgins is back at the table and looking composed.

Peter: Shaping up to be a classic, John will make a comeback, just needs table time.

Tom Willis Jnr: I think John Higgins has run out of juice and isn't playing very well this afternoon. Mark Williams will win this match in three sessions and will be the world snooker champion tomorrow afternoon.

Steve Davis
Six-time world champion on BBC Two

Worrying times for John Higgins. These next two frames are important for him because 7-1 would be awful.

Mark looks back to his brilliant best but with four sessions, plenty of things can happen and players can regroup and go on to dominate sessions on another day.

We have another two frames to go in this first session. Mark Williams is guaranteed to be leading at the end of session one, but just how wide will that advantage be?

A break of 95 is the first time in this final Mark Williams has got past 50 and it means the Welshman has restored his four-frame advantage. That is breaks of 119 for Higgins and 95 for Williams in the last two frames as the quality levels step up a notch.

Another chance for Williams in this frame.

Stephen Hendry
Seven-time world champion on BBC Two

We're still very early in this match. Mark Williams' highest break was only 42 so it's not as if he's really dominated the first four frames.

He has obviously settled far more quickly and looked more comfortable at the table but the fact Williams hasn't really dominated is something John Higgins can take away going forward.

Image source, Getty Images

Williams' run comes to a halt at 38, meaning his breaks of 42 in the second and third frames remain his best efforts.

He is unlucky in the sixth frame though as he sinks the black ball, but has no luck when going into the pack of reds. There is no shot available so safe he goes. 0-38

How will Williams respond to that Higgins century? Well, he is in early, after a loose break-off shot and has a chance for a sizeable break of his own in frame six.

Not since 2004 has a player won the title after losing the opening four frames.

Ronnie O'Sullivan was 5-0 behind versus Graeme Dott before the Rocket then stormed to an 18-8 victory.

Image source, Getty Images

Much-needed frame for Higgins with a century breakpublished at 16:08 British Summer Time 6 May 2018

16:08 BST 6 May 2018

Frame 5: John Higgins 1-4 Mark Williams (120-4, Higgins 119)

A break of 55 before the mini-interval, although he lost that frame and now John Higgins has backed that up with the first century break of the final.

Just what the doctor ordered. It has taken two hours, but Higgins is now up and playing. A stunning clearance of 119 gets Higgins on the board.

Higgins' break is up to 31. Has the mini-interval been a good chance for him to compose himself?