Both players have had chances in this 21st frame.

Selby has not been in front in this match, but will be for the first time if he can win this one. He currently trails 24-15 with eight reds left on the table and the cueball resting harmlessly near the green pocket.

Image source, Getty Images

Beaten semi-finalist Neil Robertson:, external Final should near enough be over last night. Selby set anchor today and is keeping Ronnie cold. Mark is almost favourite at this stage.

Beaten quarter-finalist Judd Trump:, external Back in England, watching the snooker in bed, such a good atmosphere.

Mark Selby's odds on a comeback triumph are shortening after he levelled the match at 10-10.

Defending champion Ronnie O'Sullivan was rated a hot 1-6 favourite on internet betting exchanges as he dominated Sunday's play, but is now out to 4-7, with Selby 13-8 (from 6-1) for a surprise victory.

Stephen Hendry
Seven-time world champion on BBC TV

"We said Mark needed to start scoring and I think he has made a 50 break in every frame so far."

Selby does not get his first century of the final, but his effort of 74 is enough to make it 10-10. O'Sullivan's lead has collapsed.

Ladies and gentleman, boys and girls, cancel anything you had planned for tonight. We are going to be in for a late evening. This is looking like it is going to be a classic.

We will be here for every ball, every frame, so make yourselves comfortable and enjoy.

Ronnie O'Sullivan 10-10 Mark Selby (7-84, Selby 74 break)

Selby has slowly taken control of this frame and has pulled level with his third half-century break in three frames.

The only other time Ronnie O'Sullivan lost four consecutive frames or more in a World Snooker Championship final came in 2004 when he lost the first five frames of the match to Graeme Dott. However, O'Sullivan recovered to win 18-8.

Don't worry, we haven't forgotten about the match, there just isn't much happening in this frame at the moment. Seven reds are on the table.

Peter PR and Radio:, external Love it when frames take ages and ages. Mark Selby is the Tavare of the table.

Sam Ferry:, external Unfortunately Ronnie has let Selby get to him! Just relax Ronnie and you've still got this!

David P:, external Mark's showing that he's definitely not past his...Sel-by date in this one.

Image source, Getty Images

Peter - Nice nod there to former England batsman Chris Tavare, but David P, we are bowled over by your pun.

Just in case you are not familiar with Chris Tavare's work, he took nearly six hours to make a 50 in an England Test match against Pakistan in 1982.

Ben Dirs
BBC Sport at the Crucible

"At times during this year's tournament Ronnie O'Sullivan has sounded like a man who has discovered the truth about snooker - that it's not just about making hay when the sun shines, but quarrying out results when things are looking grim up above.

"With Mark Selby having won the last four frames, we could be about to find out if O'Sullivan has found true snooker enlightenment."

Stephen Hendry
Seven-time world champion on BBC TV

Image source, AFP

"It's amazing, the first half-dozen shots in a frame for Ronnie. If he does not pot, it turns into a 20, 30-minute frame and that plays into Selby's hands."

Steve Davis
Six-time world champion on BBC TV

"Mark Selby has clawed his way back into the match. Ronnie O'Sullivan missed a huge tactical move in the first frame. He should have asked for a re-rack. Selby was left with a chance he should never have had."

Selby was 8-3 and 10-5 behind yesterday, but that seems a long time ago now. No matter what happens in the rest of the final, he is showing his fighting characteristics and why he is regarded as one of the toughest match players in the game. He has now won four frames in a row.

O'Sullivan still leads but the margin is one frame.

Ronnie O'Sullivan 10-9 Mark Selby (23-77, Selby 52 break)

Selby misses a frame-winning red and that should have been 10-9. He is still in control of the frame but it is not finished yet.

This frame has been a stop-start affair with neither player able to build any significant breaks yet. Selby is at the table, 41-22 in front, but with four of the seven reds tight on the top cushion.

Image source, Getty Images

Once he has completed his television commentary duties, 1985 world champion Dennis Taylor will be joining the BBC Sport website team for the first frame (frame 22) after the mid-session interval. The dog will not be around.

If you have any questions that you want to ask Dennis then tweet @bbcsnooker, external using #bbcsnooker.

Mark Selby has won three consecutive frames for the first time in this match. Ronnie O'Sullivan won the opening three frames and also captured four consecutive frames between frames eight and 11.

George Riley
BBC Radio 5 live at the Crucible

"Fire alarm went off in the hotel at 3am this morning. Selby was staying there, O'Sullivan wasn't. #bbcsnooker"

Maybe Selby slept through, judging by the bright start he's made today?...

Image source, BBC Sport

Yesterday we asked six-time world champion Steve Davis your Twitter questions. Here is the latest of his answers.

Dave asks: "Do you think Ronnie will be remembered as the best snooker player ever to grace the game?"

Steve Davis: "I think he is already regarded as the greatest player that the game has ever had. He is turning other players around to believing he is the greatest player we have ever seen regardless of his final tally of world championships."

Peter Bellamy:, external I doubt Ronnie O'Sullivan would have been impressed with Selby's exhibition-style shots at the end of the last frame.

Owen Dunn:, external Am I imagining it or are players playing on for snookers more this year?