It looks like someone has lifted the table up and tipped it one way.

Almost all of the balls - save four - are in the bottom left corner after a succession of safety shots.

Let-off for Judd Trump as a misjudged safety results in the cue ball wobbling into the corner pocket jaws - but staying on the table.

Very nervy, jittery, cautious, cagey start to this frame - which is no surprise given the situation.

Still neither player has a point after several minutes of to-ing and fro-ing.

But there's a long red on for Selby... it goes in, but no colour to follow. So back to the safety.

Stephen Hendry
Seven-time world champion on BBC Two

This bout of safety might actually help Mark Selby to get over that miss in that last frame.

It might help to calm him down and get his composure back.

Here's why we're into an 18th frame.

Mark Selby will relive this miss over and over and over while lying in bed tonight if he doesn't get over the line in this final.

What haven't we had today?

Oh a re-rack.

Check that now. With a red over the pocket and Trump rolling safe into the pack, a bout of tippy-tappy would certainly ensue so both players agree to rack the balls up again.

John Parrott
1991 world champion on BBC Two

Is anything else going to happen?! Honestly unbelievable.

Mark Selby has just made one of the best breaks the frame before - if he pots the red in the corner and stuns on the pink it's looking like it's all over.

Honestly, the things pressure can make you do.

Steve Davis
Six-time world champion on BBC Two

This is turning into one of the most exciting, tense matches we've seen at the Barbican.

You don't know what's going to happen.

Judd Trump mops up what remains on the table like a famished teenager. Well except the pink and black. They must be the veggies.

A 46 break - and he's back within a frame. Can barely believe his luck probably. Must have been sat in his chair rehearsing his runners-up speech.

Stephen Hendry
Seven-time world champion on BBC Two

It's hard to see how Mark will recover from that because that was a glorious chance to win the match.

You couldn't have wanted the reds any better.

Judd almost paused in his seat - he couldn't believe it either.

Commentators' curse, Stephen.

A sitter of a red missed. Selby has all but gifted the frame to Judd Trump with a pretty bow on top.

Stephen Hendry
Seven-time world champion on BBC Two

He's striking the ball pretty well, he's flowing now.

Now, six shots in, Selby frees the black with a tidy cannon.

This has turned from a half-chance to clinch the title into a decent one...

Is that the moment?

Judd Trump is pretty far off with a long red, fails to get back to baulk and a kiss leaves Mark Selby a routine red to start.

Work to do with the black tied up - but blue and pink available.

He comes to the table 36 points behind but a huge chance to, at worst, eat into that deficit heavily.

With the pink and black surrounded by reds, Judd Trump is having to build this break from the blue spot chiefly.

He runs out of position on 36, having rejected a couple of chances to break into the pack, safety first - unlike the world number one.

Dennis Taylor
1985 world champion on BBC Two

Pressure on every shot now for the defending champion.

He knows if he makes a mistake, it could be his last.

A good safety from Trump and a poor response from Selby means the world number one gets the first real chance in this frame.