Luke Littler is through to the semi-final!

He took control of the leg with three 140s in a row after Nathan Aspinall failed to hit a treble to open the leg.

But after just missing the bull for the match, Littler has to watch on as The Asp goes for a 160 checkout.

Treble 20, treble 20... but he just misses on tops and The Nuke returns and finds double 10 for the match.

Wayne Mardle
Former World Championship semi-finalist on Sky Sports

Michael Smith is Nathan Aspinall's mate but he'll have wanted Luke Littler to hit that. Aspinall winning makes it harder for Smith.

From nowhere, Nathan Aspinall breaks to force a deciding leg!

Luke Littler misses three darts at double 15 for the match, having narrowly missed bullseye on his previous visit.

Aspinall comes back, hits double 12 and it's suddenly a one-leg shootout...

Excellent from Nathan Aspinall, leaving himself double six with a 180 set-up.

That becomes double three but he hits and now it is back over to Luke Littler.

A hold of throw will see the teenager into another semi-final.

Wayne Mardle
Former World Championship semi-finalist on Sky Sports

This could end up being an horrific night for Nathan Aspinall in terms of league position.

All very comfortable for Luke Littler.

He does everything he has to do, hitting tops for a 13-dart hold with Nathan Aspinall lagging way behind.

The Asp needs something special to avoid a potentially costly loss.

Wayne Mardle
Former World Championship semi-finalist on Sky Sports

You don't get a lot out of Luke Littler anyway but these two are management mates. There is a respect and you underplay what you're doing.

Littler has just outscored Nathan Aspinall here. He's had 10 more darts at a double than Aspinall.

After exchanging 180s, it becomes about who is the more clinical finisher.

Nathan Aspinall manages to recover from straying into the ones to leave himself double 18 but misses it.

That allows Luke Littler in and he gets tops for a 15-dart break. The first of the match.

Luke Littler is a whisker away again on a big checkout.

He's off on the double 12 for a 141 but gets the job done eventually on his own throw.

Double three is what he needs and that's what he gets.

So close to a 161 checkout from Luke Littler!

He misses the bullseye - hitting the outer bull - for a big break of throw.

Nathan Aspinall had hit bull himself to leave tops, misses that but then gets double 10 to stay ahead. Just.

Solid leg from Luke Littler.

He finds double 10 to complete a 73 out and a 15-dart hold.

Stuart Pyke
Commentator on Sky Sports

It feels like Nathan Aspinall is behind on points in the game but he leads.

Both players come so close to big checkouts!

Nathan Aspinall misses double 12 for a 141 before Luke Littler is just off with the second going for a tops-tops finish on 137.

The Asp comes back and gets double six to keep this match on throw.

Another missed double for Luke Littler but this one doesn't prove costly.

Nathan Aspinall is well back in the 200s so despite a decent set-up, he needs another Littler slip up.

No such luck this time, the teenager hits double eight and he's on the board.

Big chance to break early for Luke Littler but he misses six darts at double, including four at his favoured double 10.

Nathan Aspinall, who had appeared to get in his own head complaining after a draft, regroups and then nips in with a two-dart 65 checkout.

After getting roundly booed in Liverpool last week - on his way to victory, I should add - it is a much warmer welcome for Luke Littler.

Still, perhaps only Michael van Gerwen can come close to matching Nathan Aspinall for a walk-on song that gets the crowd going.

Aspinall plays conductor once again as they sing along to Mr Brightside. Even Littler gets involved at one stage.

Nathan Aspinall talking to Sky Sports: "Last week against Luke Littler was the first time I've been nervous in the Premier League and it was probably because I knew if I'd won I'd be in the play-offs. I feel fresh and there are no nerves whatsoever. They are chasing me - it is always better to be at the top rather than the bottom like Smithy."

On Luke Littler: "He's a pain in the backside. He's doing my head in. I shouldn't have lost last week. It was maybe because I haven't beat him as much as I should have. Hopefully I can get the job done tonight and enjoy the last two weeks."

Image source, Reuters

Luke Littler is a "different animal" and has the potential to become the best player in darts history "if he doesn’t get too bored", says rival Peter Wright.

The 17-year-old was the World Championship runner-up at the start of the year and won the Austrian Open - his second European Tour title - at the weekend.

Littler has now lost only one of his 14 matches on the tour.

Two-time world champion Wright regularly faced Phil Taylor, who is widely regarded as greatest player of all time, but believes Littler could eclipse him.

“If he wants to do it, he could," the Scot said. "But we don’t know what his plan is. He could play for another five years and say ‘that’s it, I have earned enough’.

"He has shaken up the sport. You see him in the back room and his routine is about five minutes practice. Maybe that's what we are all doing wrong - practising too much and wearing ourselves out.”

Wayne Mardle
Former World Championship semi-finalist on Sky Sports

Luke Littler is playing the best darts right now. Luke Humphries has gone a little bit off the boil.

Littler is having the rub of the green and a bit of luck and to win things you need that.

Image source, BBC/ Getty

The second quarter-final sees a repeat of a thrilling semi-final in Liverpool last week, when Luke Littler came roaring back from 5-2 down to beat Nathan Aspinall 6-5.

Littler went on to secure his third nightly win and sits top of the table. His place at finals night is not officially confirmed yet but it would take a remarkable run of results to deny him.

Meanwhile, Aspinall is up to third but still has work to do to cement his top-four spot.

He won in Rotterdam on night 12 - his second nightly win of the year - and has only gone out in the quarters once in the last seven weeks, making three finals.

Another run to the final tonight would go a long way to getting him to the O2 in three weeks' time.