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Katie Boulter is struggling to rekindle the magic that took her to a famous win over world number two Elena Rybakina in the last eight.

Another double fault and a poor attempted drop shot hand Donna Vekic two break points.

Boulter saves them both, thanks to some more accurate serving, but a second botched drop shot gives her opponent a third break point of the game and the Croatian takes it after the Briton fires into the net.

No chance for Katie Boulter there, another hold to love from Donna Vekic.

Katie Boulter produced four double faults and 12 unforced errors in total in that first set.

She added another double fault to the count in the first game of the second set and let her opponent back into the game with an unforced error as Donna Vekic took her to deuce.

But this time 29-year-old Boulter held her nerve to escape with the game, following up a 108mph first serve with a crashing winner.

Donna Vekic breezes to the first set, winning another game to love, finishing off with another strong serve that Katie Boulter has no answer for.

It's a long way back from here, but Boulter has shown in her run to the Queen's semi-finals that she has plenty of bottle when it counts.

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That looked to be more like it from Katie Boulter -the world number 73 matches Donna Vekic's heavy hitting in the longest rally of the match before putting herself 30-15 up with an impressive forehand winner into the corner.

Two lax points, including a double fault, put Boulter at risk of losing another service game, but she rallies to force deuce.

But a running winner down the line gives Vekic another break point and the Croatian goes 5-1 up, heading towards the first set, after another unforced error from Boulter.

Katie Boulter takes Donna Vekic to deuce as she starts to make inroads into the Croatian's serve, but a strong overhead at the net puts Vekic a point from the game and Boulter goes long with a wild shot in the next rally.

The Briton remains a break down in this opening set.

A shriek of "come on" from Katie Boulter follows a wide shot from Donna Vekic, which sets up game point, and the Briton follows with a strong serve to win the next and get a game on the board.

Katie Boulter goes long with a forehand and Donna Vekic opens a 3-0 lead in the opening set, dropping just a point in her second service game.

Can Boulter respond?

A net cord helps set up a first break point of the match for Donna Vekic at 30-40 and a double fault from Katie Boulter hands her Croatian opponent a 2-0 lead.

It's been quite the whirlwind already today for Boulter, who needs to quickly reset after yesterday's thrilling quarter-final victory.

Right, we move straight into semi-final action now, with GB's Katie Boulter up first against Croatian Donna Vekic.

Vekic made short work of her opening service game, winning that to love.

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Raducanu takes the opening set in style - having found her form after a break in play.

The fifth game of this first set was stopped for around four minutes, due to the court being on the route of the Royal flypast for the King's Trooping the Colour in central London.

It looks like it's getting warmer out there on the court as Raducanu seeks to wrap up this match as quickly as possible.

Raducanu has started with lots of energy, despite the possibility of needing to play again later against Iva Jovic.

The weather is looking good in London so far.

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Andy Murray Arena

Singles quarter-final: Emma Raducanu v Kamilla Rakhimova

Singles semi-final: Katie Boulter v Donna Vekic

Singles semi-final: Raducanu/Rakhimova v Iva Jovic

Court 1

Doubles semi-final: Leylah Fernandez & Laura Siegemund v Iva Jovic & McCartney Kessler

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An inspired Katie Boulter celebrated the biggest win of her career by ranking as the Briton ousted world number two Elena Rybakina to reach the Queen's semi-finals.

Having overcome Jaqueline Cristian earlier in the day to reach the last eight, Boulter returned to court on Friday evening and stunned Australian Open champion Rybakina in an outstanding 7-5 2-6 6-4 victory.

World number 73 Boulter saved 12 of the 14 break points she faced over two hours and 39 minutes against former Wimbledon winner Rybakina.

The 29-year-old was roared on by passionate home support and skipped across the court in delight after Kazakh Rybakina netted a return on Boulter's third match point.

Boulter will next face Croatia's Donna Vekic for a place in the final.

"Honestly, I am not really sure what to say. I really feel like this win definitely goes to the crowd that got me through it tonight and stayed out here," Boulter said.

"That was absolutely incredible. I just tried to tell myself to keep backing myself and go for it. If you don't go for it, you're going to regret the things you've worked so hard for."

Fellow Briton Emma Raducanu could potentially also have to play two matches in the same day after reaching the quarter-finals earlier on Friday.

Raducanu achieved her first win against a top-20 opponent in over a year by eliminating Romanian world number 18 Sorana Cirstea 6-4 6-2 to reach the last eight.

It was a significant win for Raducanu against an opponent who thrashed her in the Transylvania Open final in February - and the 23-year-old had not won back-to-back matches since that tournament four months ago.

But there was not enough time for the British number one to contest her quarter-final against Kamilla Rakhimova - meaning she would need to play that match and her semi-final on Saturday should she defeat the 78th-ranked Russian-born Uzbek.

No play was possible at Queen's on Thursday because of rain, meaning all four quarter-finals needed to be played on Friday.

Serena Williams' doubles campaign at Queen's has been curtailed as her playing partner Victoria Mboko has withdrawn with a left knee injury.

The 23-time Grand Slam singles champion, 44, made her return to tennis on Tuesday after almost four years away from the sport.

The pair had been scheduled to play their quarter-final on Thursday but Mboko, 19, suffered a nasty fall in her singles match on Wednesday, which forced her to retire from the match.

Trailing 6-2 3-4 against Karolina Pliskova, the Canadian teenager cried out in pain as she went down clutching her knee and she limped off the court in tears.

It means her compatriot Leylah Fernandez and Germany's Laura Siegemund, who they were scheduled to face in the doubles on Thursday, advance to the semi-finals.

"What a fun and memorable week at the HSBC Championships. Thank you to everyone who made it so special," Williams posted on Instagram.

"Vicky Mboko, you're an incredible talent and you'll be back out there in no time.

"Wishing you a speedy recovery."

Williams returned with a winning performance on Tuesday as she and Mboko won 7-6 (7-2) 6-2 to upset third seeds Erin Routliffe and Nicole Melichar-Martinez.

Playing 1,375 days after her last competitive match, Williams - one of the greatest players of all time - didn't look a touch out of place as she rediscovered her powerful serve and groundstrokes.

The extent of Mboko's injury has not yet been confirmed but there are concerns that the world number nine could miss Wimbledon, which starts on 29 June.

Saturday, 13 June

13:30-19:30 - BBC Red Button, BBC iPlayer, BBC Sport website & app (13:25-17:20 - BBC One)

Sunday, 14 June (Final)

13:00-19:30 - BBC Red Button, BBC iPlayer, BBC Sport website & app (13:15-15:45 - BBC One)