Once again, Olivia Nicholls take a bow. She levels the tie-break at 5-5 with a brilliant volley, and they then leave a long Australian strike to earn SET POINT.

Australia strike back through Sam Stosur at the net, but Storm Sanders then fails to clear the height.

The Aussies win the next point on their own serve.

All square at the change of ends.

GB get the mini-break back as Sam Stosur shoots far too long off the forehand.

Russell Fuller
Tennis correspondent at Emirates Arena

Remember, Britain now need to win two consecutive, but different length, tie-breaks if they are to reach the final - as a 10-point breaker is played instead of a third set in Billie Jean King Cup doubles.

Hawk-Eye is called into action straight away but it proves the line judge's decision to be correct and the first point is Australia's.

They then get the mini-break but Storm Sanders nets a forehand.

Mel South
Former British player on BBC TV

I can't breathe at the moment. What tension.

A nerve-wracking game is held by GB as Sam Stosur nets a forehand from up close. To another tie-break we go!

Katie Boulter and Heather Watson acting as chief cheerleaders on the sidelines for the British pair.

A 40-15 hold for Australia with solid hitting from Sam Stosur.

A pivotal moment now for Great Britain. They have to hold this next game or they are out of the Billie Jean King Cup.

Mel South
Former British player on BBC TV

The Brits have to focus on each point as it comes. Keep looking forward.

Gulp. This time, Olivia Nicholls misses her chance at the net and Australia break back.

All square in the second set again.

Oh heck, Australia save the break point at the net.

Deuce.

Olivia Nicholls delivers the goods at the net again as GB fight back from 0-30 down to draw level.

And then again! More sterling work from Nicholls and it's set point for GB at 40-30...

A comfortable hold to 15 for Australia and the pressure swings back on to the shoulders of the GB pair.

Alicia Barnett to serve for the set. The Brits come sprinting out of their chairs. They want this.

Mel South
Former British player on BBC TV

The British team need to be really boosted by this lead and swing out on these returns if they can get a racquet on the ball.

GB find themselves 0-30 down but scramble back to level, and then to game point with a nice touch from Olivia Nicholls at the net.

Australia get an opportunity to break back though, as the game goes to deuce, but GB avert the danger with a overhead smash.

Storm Sanders to serve to keep Australia in the set.

Image source, Getty Images

Russell Fuller
Tennis correspondent at Emirates Arena

For all Sam Stosur’s success and experience, she has had very little success on the doubles tour in recent months and she is definitely the weaker link for Australia right now.

Barnett and Nicholls just love these occasions...can they turn the semi-final around?

Not to be this time, Sam Stosur hitting a forehand down the line that GB can only push out of court.

BUT THEN. GB get the break as Stosurs returns wide.

Pandemonium in Glasgow.

Image source, Getty Images

Break point Great Britain at 30-40...