Collins goes wide.

15-0 as Kvitova puts away an overhead.

30-0 as she wrongfoots Collins before Kvitova's backhand slice from the back lands wide.

30-15.

30-30 after Kvitova makes another error. Not good timing Petra.

The Czech player is a game away from her third Grand Slam final after another Collins error.

Did Kvitova's forehand return land in though?

No challenge and the end is nigh.

Crosscourt delight from Kvitova who returns too flat for Collins.

Break point number two.

To be continued...

Advantage Kvitova.

The Czech player, to the relief of her opponent, goes long.

40-30 with a big serve which morphs into deuce as Collins goes long.

The American needs this.

She really does.

Collins is struggling

0-30.

But she rediscovers a bit of that fight we saw earlier by sending Kvitova out wide and forcing her into an error.

15-30.

Collins then punches away a double-handed winner at the net.

30-30.

Poor from Kvitova - she was in control at the net but failed to put away a volley allowing Collins to take advantage.

30-30.

But then an ace.

40-30.

Kvitova holds after a little bit of pressure. She looks like she's drinking confidence out of a schooner.

Image source, Getty Images

15-0.

Kvitova then sends down the best ace of the match - if you can have a best ace - wide and fast.

30-0.

30-15 as Kvitova goes long from the back of the court.

Kvitova conducts that rally brilliantly - she sends Collins long with a lob which is fed back but then dispatched by the 28-year-old.

We're suddenly at 0-40.

Kvitova produces another winner - what happened to those unforced errors Petra? - and breaks once more.

She can sniff the final.

15-0.

15-15 after a Kvitova double fault.

A brilliant double-handed backhand from the two-time Wimbledon winner brings up 30-15.

And then Collins obliges with two more errors as Kvitova holds.

A very easy service game for the Czech player.

Collins needs inspiration.

Jonathan Jurejko
BBC Sport at Melbourne Park

A quick dash from Laver to the media centre has left me sweating.

And the heat index still rising...

Image source, BBC Sport

More like eye of the storm.

Kvitova converts.

Collins is, fair to say, not best pleased, with anything.

One saved with a spanked forehand beyond the reach of Kvitova.

Eye of the tiger Danielle, eye of the tiger.

30-40.

15-30.

The frustration is growing within the world number 35.

Now the bleeping machine is bleeping as Collins is serving. The American is complaining to umpire Carlos Ramos.

15-40.

Two break points.

Collins changes her racquet.

Image source, AFP

Daggers at the umpire. Collins produces a first serve that she thinks is good, but it isn't.

Kvitova punishes the second serve.

0-15.

Parity with an ace.

15-15.

Ace.

6-2.

Kvitova takes the first of four set points as she rushes into the net to punch away a winner.

Scream of delight from the two-time semi-finalist.

Image source, AFP

5-1 - Collins is broken again as she lands a ball too short which allows Kvitova to hit a winner.

Collins is now ranting to the umpire over a point. Rant over.

5-2 - At least the American has won another point.

Kvitova has the chance to claim the set on her serve.

3-1 - Another good serve from Kvitova sees her preserve her break.

4-1 - The experience is telling as the Czech player booms down another big serve.