Humphries is being pushed to his limit here, he's going at a 113 average in set five.

Both men have had 24 100-plus visits in this match.

Both men start leg three with 140s.

Back up by a maximum for Clemens! While Humphries can only get 85.

Clemens then strikes 135 to leave a 46 finish... knocked in, that's an 11-dart leg. Superb.

A weaker leg from Clemens leaves Humphries with a finish of 70, while the German is back on 157.

Humphries knocks it out, no bother.

Glen Durrant
Former Premier League champion on Sky Sports

Gabriel Clemens is beginning to make this uncomfortable for the number two seed.

Clemens has won six of the last seven legs. He has forced his way back into the match.

Another 180 from Clemens, Humphries responds in kind.

Clemens tries to find a 96 checkout, just wide of doubles. But Humphries can't finish either.

Three at D8 for Clemens - he needs all three, but lands it.

But will that brilliant set from Clemens be in isolation, or can he follow it up?

The German throws first in set five.

Stuart Pyke
Commentator on Sky Sports

What a set of darts from Gabriel Clemens. He is rolling back the years with arguably his best set of darts for three years.

Gabriel Clemens averaged 115.62 in that last set, with six 140-plus visits and 100% at doubles.

A contender for the best set of the entire tournament.

Gabriel Clemens has not averaged over 100 in his last 27 matches. This performance was not on the cards.

Be sets up a 116 finish - and bags it!

Clemens, back from the dead?

Luke Humphries, once again, bites back with a maximum - followed by 140.

However Clemens smashes in a 121 finish, again on the bull, for a 12-dart leg!

From nothing, we have a potential thriller on our hands.

Gabriel Clemens is averaging 99 in this match, he is playing well. But Humphries has barely missed a chance all game.

Clemens though gets a break with the lesser spotted D13!

Stuart Pyke
Commentator on Sky Sports

I've got four words for you: darts of a champion!

Glen Durrant
Former Premier League champion on Sky Sports

That is a champions response from Luke Humphries.

Luke Humphries has to respond, and does so with a 180.

He finishes 44 to break back on Clemens and claim the third set.

Don't poke the bear.

Stuart Pyke
Commentator on Sky Sports

This is a purple patch from Gabriel Clemens. He's flying now.

Can Clemens back that up by breaking Humphries? He's landed a 140 and 180 to start this leg. Then another 140!

Humphies is nowhere, as Clemens pulls an 11-darter from nowhere.

How quickly things can change.

There is a fairly muted atmosphere in Ally Pally at present. This feels like something of a procession.

Until now! Clemens is on 125, and finishes it with bull, 25, bull.

A tremendous bit of showmanship by the German.

It just isn't landing for Gabriel Clemens, too many sub-100 visits from the German.

Humphries misses a bull out, but Clemens comes nowhere near the 134 he needed to punish the second seed.

Glen Durrant
Former Premier League champion on Sky Sports

Image source, Getty Images

Luke Humphries is just seizing control of this game and asking Gabriel Clemens some serious questions right now.