Johanna Konta overcame a nervous finish to knock out two-time former champion Petra Kvitova and reach the quarter-finals of Wimbledon for the second time.

The British number one weathered an early storm in a battle of fierce hitting from both players and was on the verge of victory at 5-1 in the final set.

Kvitova fought back with a run of three games in a row, saving two match points, but Konta served it out at the second time of asking to win 4-6 6-2 6-4.

There had been major doubts about Kvitova's fitness prior to the tournament, with the 29-year-old not having played a match since before the French Open because of a left forearm problem.

She had barely even been able to practise but, having won all of her first three matches in straight sets, it seemed fair to assess that Kvitova was feeling close to 100 per cent.

Konta and Kvitova embrace after the match

It certainly looked that way in the early stages as she thumped winner after winner - 11 in the first five games alone. But Konta is a talented ball striker, too, and she stayed with her opponent very well.

Kvitova had won three of their four previous meetings, with Konta's only victory coming in Eastbourne in 2016, but it was the Brit who had the momentum and she struck a series of fierce backhands to break for a 2-1 lead in the decider.

The final one was called out, then shown to be in via HawkEye, and Konta gave umpire Kader Nouni no time to consider replaying the point, striding to her chair.

A run of five successive games took her to the brink of victory but, serving for the match at 5-2, things became complicated. Two match points came and went and Kvitova retrieved one of the breaks. When Konta stepped up to serve for the match again, the air of tension around Centre Court was palpable, but this time she made no mistake. 

Teenage sensation Cori Gauff's fairytale run at Wimbledon was ended by seventh seed Simona Halep.

The 15-year-old, who beat Venus Williams, Magdalena Rybarikova and Polona Hercog to reach round four, bowed out 6-3 6-3 against the former world number one.

The result should come as no surprise, as 12 months ago Halep was the world number one while Gauff was losing in the quarter-finals of the juniors tournament.

Yet Gauff, known as 'Coco', went toe-to-toe with Halep, again showing no signs of being daunted in such illustrious company.

There were nerves, understandably, and Gauff's serve came under immediate scrutiny with Halep securing a break in the first game.

Gauff broke straight back, then held, and suddenly Halep had the jitters with a double fault, although she too held serve for 2-2.

Break point down, Gauff casually volleyed a winner with all the poise of the seasoned grand-slam winner she was facing.

However, Halep's experience told as she secured another break on her way to wrapping up the first set.

The signs were ominous when Halep went 2-0 up in the second, but yet again Gauff hit back, before asking for a doctor courtside.

If the youngster was feeling unwell she was not showing it, coming from 0-30 to hold for 2-2.

Halep has been there and done it, though, and once again the 27-year-old turned the screw to move 5-2 up.

Although Gauff saved a couple of match points on her serve - one with another nonchalant volley - Halep eventually ensured the American's Wimbledon adventure came to an end, for this year at least. 

Ashleigh Barty's hopes of winning back-to-back grand-slam titles were ended by a shock fourth-round loss to unseeded American Alison Riske.

Barty had won 15 matches in a row and had not so much as dropped a set since the French Open semi-finals a month ago but Riske played superbly and the 3-6 6-2 6-3 victory was the biggest of her career.

The 29-year-old, who has also knocked out Donna Vekic and Belinda Bencic in a giant-killing run, is through to the quarter-finals of a slam for the first time, where she could face Serena Williams. 

Riske told the BBC: "I am so excited. I think ultimately I am so proud of myself for the way I handled myself in this match."

Serena Williams had a comprehensive 6-2 6-2 victory over Carla Suarez Navarro.

Williams, sporting a child's plaster on her left elbow, never looked like coming unstuck against the world number 31.

Two breaks of serve gave her the first set in just 31 minutes, the highlight a stunning flicked backhand across the helpless Suarez Navarro.

Williams also looked more confident at the net than in her previous matches, so maybe the Murray link-up is paying off.

Two more breaks at the start of the second put Williams in total control, although Suarez Navarro did at least lay a glove on her with a surprise break to love.

It was only a temporary blip, as Williams broke back before serving out the match to set up a meeting with fellow Alison Riske.

Third seed Karolina Pliskova followed world number one Barty out of the tournament on what turned out to be a manic Monday, losing a mammoth third set 13-11 to Karolina Muchova.

Pliskova raced through the first set 6-4 before Muchova responded to take the second 7-5 and set up a decider.

It looked like going to a first ever final set tie-break at 12-12, but Muchova broke at the crucial moment.