Great Britain 2-1 Germany in BJK Cup qualifying
Olivia Nicholls/Harriet Dart lose to Laura Siegemund/Anna-Lena Friedsam in doubles
Katie Boulter comes from set down against Tatjana Maria to give GB unassailable lead
Sonay Kartal earlier beat Jule Niemeier on debut to give GB lead
Great Britain will take on the Netherlands tomorrow in a bid to top Group F and qualify for the Final
Kartal 6-4 4-1 Niemeier*
Lovely controlled drop shot from Sonay Kartal to bring up game point.
The world number 60 draws the error from Jule Niemeier in a long rally from the baseline to retake a three-game lead in this set.
*Kartal 6-4 3-1 Niemeier
Naomi Cavaday
Former British tennis player on BBC Red Button
A great serve to seal that game - Jule Niemeier needed that.
It's something for her to hold on to in this set, but can she turn this into a bit of a run now?
*Kartal 6-4 3-1 Niemeier
This is a tough ask now for Jule Niemeier, a set and a break down.
It looks like she's going to get herself on the board, drawing out a 30-0 lead, but Sonay Kartal draws level.
The German eventually takes the hold to 30 and that will boost her confidence.
Kartal 6-4 3-0 Niemeier*
Naomi Cavaday
Former British tennis player on BBC Red Button
Sonay Kartal is barely missing anything. It is rock solid.
At the moment, it is more than enough to stay right on top of Jule Niemeier.
I think she can start enjoying things now - I've seen a little smile from her.
Kartal 6-4 3-0 Niemeier*
A first real sign of emotion from Sonay Kartal as she smiles back at her Great Britain team-mates when she forces the error from Jule Niemeier.
She takes the hold to 15 to stretch a three-game lead in this second set.
*Kartal 6-4 2-0 Niemeier
Great shot from Sonay Kartal to break Jule Niemeier's serve at the fourth opportunity.
Image source, Getty ImagesKartal 6-4 1-0 Niemeier*
Naomi Cavaday
Former British tennis player on BBC Red Button
Kartal is looking very positive now in this match.
Niemeier needs to get her head back in the game. She needs to find a bit of traction here early on but she has regained her composure nicely.
The added passion and pride is what holds the Billie Jean King Cup so high, as well as that added pressure for your team.
Kartal 6-4 1-0 Niemeier*
Jule Niemeier works her way back into the game, saving both break points. But then makes another costly error, firing into the net, to hand Sonay Kartal a third break-point opportunity.
Kartal 6-4 1-0 Niemeier*
Jule Niemeier has managed to compose herself but Sonay Kartal is not messing around here and she brings up two break points.
Kartal 6-4 1-0 Niemeier*
Good start to the second set by Sonay Kartal as she takes the opening game to 15.
Image source, Getty Images*Kartal 6-4 0-0 Niemeier
Oh no. Jule Niemeier looks really upset at the break after that first set. Head in hands with the towel over her head.
She'll have to try to regroup to get back into this one.
Image source, Getty ImagesKartal 6-4 Niemeier
Naomi Cavaday
Former British tennis player on BBC Red Button
Sonay Kartal gets there in the end! She was really ramping up the pressure.
That was a cool, calm and collected set of tennis from Kartal - on her Billie Jean King Cup debut.
A brilliant set of tennis.
Kartal 6-4 Neimeier
Russell Fuller
Tennis correspondent in the Netherlands
The rankings of British players often don’t make much progress during the clay court season, but Sonay Kartal could buck that trend.
“It’s a surface I love playing on and one that enhances my game style even more” she says.
And despite being broken three times, she is now in front on the clay in her first shot at a Billie Jean King Cup match.
Kartal 6-4 Niemeier
Sonay Kartal takes the set at the third opportunity as Jule Niemeier sends wide.
A few costly errors from the German and she's disappointed with herself. A brilliant start to Kartal's debut in the competition.
Image source, Getty ImagesKartal 5-4 Niemeier*
Jule Niemeier slams a forehand into the net and Sonay Kartal will have a third go at set point.
Kartal 5-4 Niemeier*
Sonay Kartal thinks Jule Niemeier's forehand on game point is wide. The umpire hops down to have a look and she's right.
A let off for Kartal.
Kartal 5-4 Niemeier*
Naomi Cavaday
Former British tennis player on BBC Red Button
Jule Niemeier might just be able to wriggle out of this game, but it is starting to feel a bit edgy...
Kartal 5-4 Niemeier*
Jule Niemeier finds a big ace which kisses the line to save set point.
But for the second time in the game, the German double faults at the worst moment after pulling away to advantage and we go back to deuce.
Kartal 5-4 Niemeier*
Jule Niemeier recovers to take us to deuce but Sonay Kartal stays patient with big strokes from the baseline and brings up another opportunity.
Kartal 5-4 Niemeier*
Frustration from Jule Niemeier as her drop shot falls the wrong side of the net and offers Sonay Kartal hope at 15-30.
A double fault hands Kartal set point. What a time to double fault.
