Image source, PA Media

An incredibly scrappy leg - where both players missed almost double-figure chances at doubles.

But it's Luke Littler who eventually lands double two to take it.

He's four legs from the final!

Fine margins. Interesting that Smith is not watching any of Littler's darts.

Luke Littler has two darts at double 14 for a double break.

He misses both - but comes back after Smith misses bull.

However, Littler misses three more darts. But Smith can't punish him.

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Smith needed an Usyk round nine but doesn't get the treble.

Michael Smith, though, is struggling to make many inroads into the Littler throw.

He's not had a dart at a break yet - and Littler lands double top to continue that pattern with Smith waiting on a finish after his best leg against throw.

As much as we are waxing lyrical about Littler, Michael Smith is doing just fine. He's got the experience and a lot can change in this game.

The arena is absolutely amazing, I was beginning to panic but boy, did it fill up. The atmosphere is electric.

What has Michael Smith got in response?

Well, he digs out a crucial hold of throw with a clutch dart at double four.

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You might be right, Stevie.

Littler is proving deadly on doubles so far, landing double 15 to stretch his lead and consolidate that break.

Stevie J, Portsmouth

This fascination of Luke Littler, he's going to have ups and downs in his career, but he means business. His mannerisms walking to and from the board and boy, he means business tonight.

Luke Littler two darts off a nine-darter!

After seven treble visits, the eighth arrow is errant to the despair of the 14,000 in attendance.

But he brushes off that disappointment to break throw.

A great touch there from Michael Smith who congratulates Luke Littler.

Oh here we go.

Michael Smith piles on the pressure on the Littler throw with the first 180 of the match.

The teenager responds by taking out 144 with treble 20, treble 20, double 12.

The crowd are loving this pace and I think we are going to see this throughout the night, the pace will suit all four of them.

When Littler means business and is up for the challenge, which is what I see tonight, it is going to take something special to beat him.

First to 10 legs in these semi-finals, remember.

Smith responds to Littler taking out 68 in the opening leg by nailing 67 with tops.

When these two have played in seven meetings so far this season, the player who threw first has gone on to win.

The only advantage Luke Littler gets from finishing top of the regular-season table is that he gets to throw first in this semi-final.

And he makes it count with a nice treble 16, double 10 combination finish to checkout 68.

Matt, West London