Woah, what a start this is from Katie Boulter. Winner after winner and she's got herself three early break points.

*denotes next server.

Here we go then. Can Katie Boulter seal GB's place in the final of the Billie Jean King Cup for the first time in 43 years?

Slovakia's Rebecca Sramkova serves first to get us under way.

Mel South
Former British player on BBC TV

There's going to be aggressive tennis, that's for sure. I think the court surface helps Katie Boulter out here and she will look to get a bit of revenge over her opponent.

Definitely helps Boulter that she is coming out here 1-0 up, it's more excitement rather than pressure.

Next up, it's the number ones of Great Britain and Slovakia respectively.

Katie Boulter, like Emma Raducanu before her, comes into this semi-final with two straight-set wins under her belt.

Boulter, the world number 24, takes on 43rd-ranked Rebecca Sramkova shortly - knowing a win will take GB through to the final.

Laibah: It's exciting to see Emma Raducanu's performance in the BJK Cup! Do you think Katie Boulter will bring the same energy against Rebecca Sramkova from Slovakia? The anticipation for the Billie Jean King Cup final is building up!

More from Emma Raducanu, speaking on court after her victory:

"It's amazing to have this support. Today I felt like I needed it and the team is going to need it. I really appreciate so much support from everyone on the GB side.

"I'm going to get everything done as soon as possible so I can come back here and support, and give everything like I just did on the court on the bench. I wish Katie well, she's playing amazing and I can't wait to come out and support her as well."

Image source, Getty Images

Great Britain's Emma Raducanu, speaking on court after her 6-4 6-4 win over Viktoria Hruncakova:

"Every match is extremely challenging and as the tournament progresses it's more and more. It was a really tough battle because my opponent has a huge ball-strike and she plays much above her ranking. On these courts, it really suits her. But I was really pleased with how I composed myself and served it out in both sets.

"Both sides of hers come with extreme power and if you give her time to either side, she can really hit it. The tactic was to try to keep her moving and not let her get the first strike in. I did that well with my serving and starting the point and I'm really happy to come through that."

Mel South
Former British player on BBC TV

Stunning moments from Emma. She did so well in both sets, because she had her back against it.

When it really counted she went back to routine. You can see from her face there's that relief as well as excitement, the fact that Great Britain are 1-0 up in this tie.

Emma Raducanu is speaking on court now and she says it's "amazing" to have the support of a gaggle of British fans in Malaga. Full quotes to come.

Soon, we'll be seeing British number one Katie Boulter on court. A win for Boulter will see Great Britain through to Wednesday's final against Italy.

Sue Thearle
Tennis commentator on BBC Red Button

Emma Raducanu's immaculate week continues. She hasn't dropped a set and she has delivered another priceless victory.

She gives Great Britain real momentum at the start of this semi-final. What performance and what a win to get Anne Keothavong's team going in this.

Hruncakova goes long with a forehand, and then wide with a forehand.

Two match points...

Here we go then...

Not the best opening point for Raducanu as the Brit finds the net.

But it's a sparkling forehand winner to get her back to 15-15.

Mel South
Former British player on BBC TV

Viktoria Hruncakova is really stepping up the pace and the power.

If it keeps going that the winners come past you, there's not much you can do about it.

Emma Raducanu is going to need a response here.

Viktoria Hruncakova wraps up a hold to 15 with an unreturnable serve.

Emma Raducanu will now have a second opportunity to serve out the match.

The power of Viktoria Hruncakova, who maybe thinks she has nothing to lose right now, is simply too much and a crushing cross-court backhand confirms the break back for the Slovakian.

Viktoria Hruncakova finds a winner down the line for three break points.

The first is saved by Emma Raducanu... and so is the second with an ace.

But if it's going to be this game, Raducanu will have to do it the hard way, as Hruncakova smashes her way to a 0-30 lead.

One more game required to put Great Britain in a great spot to reach their first final of this competition since 1981.