Wimbledon 2019: Jo Konta, Serena Williams and Ashleigh Barty book places in round four

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• Click here for doubles review, including Andy Murray

Johanna Konta battled back from a set down to sink Sloane Stephens and reach the last 16 at Wimbledon for just the second time.

The British number one, who reached the semi-finals here in 2017, appeared on the brink of defeat with former US Open champion Stephens, seeded nine, dictating the match and errors creeping into Konta's game.

But Konta managed to stop the bleeding and haul herself level before a composed final set wrapped up a 3-6 6-4 6-1 victory and extended her 100 per cent record against Stephens to four matches.

The most recent of those wins was a 6-1 6-4 pummelling en route to the last four of the French Open in May, where Stephens was overrun by Konta's energy and intensity.

It seemed she had learned a lesson from that painful defeat, with the American soaking up the power from Konta and moving her all around the court.

Momentum started to change when Konta forced a break point, her first of the match, at 4-3 but, facing a second serve, wastefully pushed the return long and the chance disappeared.

The 28-year-old had to quickly put that setback behind her and, to her credit, she did, a comfortable hold followed by a break, at the second attempt, to level the match.

The 2017 semi-finalist had transformed the match. Suddenly Stephens' range had deserted her, and a rejuvenated Konta held to love before breaking twice to book a fourth-round meeting with two-time champion Petra Kvitova on Monday.

"She was playing incredibly well and I was fully prepared to be not coming back after that second set," Konta told the BBC. "I was pleased I was able to keep battling, to keep with her, mix things up and get her out of that zone.

"It was incredibly tough out there, she's an incredibly good player. I really had to work hard to get myself into the match and get my level up to hers. Every round is trickier. I'm just really pleased to have come this far. I'm really pleased with the tennis I'm playing and looking forward to playing Petra, one of the best players in the world."

Serena Williams laid down a marker in her bid for an eighth Wimbledon title with a straight-sets win over the dangerous Julia Goerges.

In a repeat of last year's semi-final, Williams was too strong for the German 18th seed and triumphed 6-3 6-4.

Maybe hitting with Andy Murray, her mixed doubles partner, on Friday has had a positive effect as the American was moving and serving much better than in her first two matches.

Williams, seeded 11, secured a break for 4-2 in the first set and despite some concerted Goerges pressure she served it out.

Goerges is no slouch with the ball in her hand either but the relentless Williams returns forced another break, at the fourth attempt, for 3-2 in the second.

Williams had not dropped a set in her four previous encounters with Goerges and she maintained that record to demonstrate that, at 37, she remains a major contender for the title.

Harriet Dart's fine Wimbledon run ended with a bruising defeat by world number one Ashleigh Barty in the third round.

It was a singles debut on Centre Court for both women but the gulf was all too clear as Barty wrapped up a 6-1 6-1 victory in just 53 minutes to reach the fourth round for the first time with a 15th consecutive win.

The considerable consolation for Dart is that by reaching the third round she had far exceeded expectations and her ranking will rise from its current 182 into the top 140.

As is customary on middle Saturday, the start of play was delayed while the sporting royalty in the Royal Box was introduced and the work of the members of the Armed Forces who serve as stewards applauded.

The biggest cheer came when Rod Laver was presented with a replica trophy to mark 50 years since the second of his calendar Grand Slams.

The Red Arrows' fly past came a little late and, unfortunately for Dart, in between her first and second serves.

This was the second time this year that the 22-year-old has found herself on one of the biggest stages in tennis taking on a star of the game after losing 6-0 6-0 to Maria Sharapova in the first round of the Australian Open.

The top seed will take on American Alison Riske in the fourth round on Monday.

Barty said: "It was really good. I felt like I served really well. I just tried to do as best as I could to get a good start.

"I think today I was able to overpower her a touch. Harriet is going to have a fantastic career."

Fourth seed Kiki Bertens was upset by Barbora Strycova in the third round as another big name fell on the women's side at Wimbledon.

Bertens, a quarter-finalist last year, saved match point in her second-round victory over Taylor Townsend but was unable to find the same powers of recovery as Strycova eased to a 7-5 6-1 victory.

The fiery 33-year-old Czech is a known danger on grass. She made her debut at Wimbledon 16 years ago and reached the quarter-finals in 2014.

Strycova, ranked 54, will play Belgium's Elise Mertens, who battled past 15th seed Wang Qiang.

Bertens is the second of the top four seeds to fall after Naomi Osaka's first-round loss to Yulia Putintseva.

Two-time champion Petra Kvitova strolled into round four with another straight-sets win.

The Czech sixth seed, yet to drop a set all week, beat Magda Linette of Poland 6-3 6-2 in just over an hour.

Belinda Bencic, the Swiss 13th seed, was ousted in three sets by Alison Riske.

Bencic took the opener and appeared to be cruising into round four but American Riske fought back to win 4-6 6-4 6-4.

Related Wimbledon 2019 links

• Click here for printable men's draw PDF
• Latest Wimbledon odds
• Wimbledon men's betting preview
• Wimbledon women's betting preview
• Wimbledon men: The contenders
• Wimbledon women: The contenders
• Wimbledon: By the numbers
• Wimbledon: Talking points