Wimbledon champion Garbine Muguruza was knocked out of the Nature Valley Classic with a 6-2 6-4 defeat by Barbora Strycova in Birmingham.

The top seed got back into the match by breaking to lead 4-2 in the second set but lost the next four games.

There was no such trouble for defending champion Petra Kvitova, who beat Daria Gavrilova 6-2 6-2 to reach the quarter-finals.

The Czech next faces Julia Gorges or Nottingham Open winner Ashleigh Barty.

In windy conditions, Kvitova raced into a 4-0 lead in the first set before being pegged back by Gavrilova in a match lasting nearly one hour 20 minutes.

The two-time Wimbledon champion sealed victory on her first match point when the Australian world number 25 fluffed a smash.

“I think a few of the games were very tight, especially when you need to break. It’s always tough to get the break on the grass,” Kvitova said.

“The grass helped me, for sure. That’s my surface. It was great.

Inspired to play tennis?

Find out how to get into tennis in our special guide.

Tennis fans will be able to watch Wimbledon coverage in ultra high definition for the first time when the tournament gets under way on 2 July.

All Centre Court matches will be in Ultra HD via BBC iPlayer as part of a new BBC trial.

Live matches will feature daily across BBC One, BBC Two and BBC Radio 5 live.

And there will be up to 16 live HD streams on the BBC Sport website and app, iPlayer and via the Red Button on Connected TVs.

Sue Barker will again lead the television coverage from 11.30 BST daily (11:00 BST on day one).

The BBC’s Barry Davies will be making his final Wimbledon bow and a special BBC One documentary will honour the long-serving commentator. Barry Davies: The Man, The Voice, The Legend will air on 4 July.

Tennis legends including John McEnroe, Martina Navratilova, Boris Becker and Billie Jean King and Grand Slam winners Tracy Austin, Pat Cash and Kim Clijsters, as well as Wimbledon favourite Tim Henman, will all give their expert views.

McEnroe will also be hosting 5 live’s 6-love-6 show.

Throughout the fortnight, listeners can ask their smart speakers to ‘Take me to Wimbledon’ to hear a short, light-hearted and informative audio insight into the tournament.

“We can’t wait to bring the most prestigious tennis event to the widest possible audience through our market-leading TV, radio and digital services,” said Barbara Slater, director of BBC Sport.

“Tennis fans will have all the key action covered wherever and whenever they want it thanks to our new live streaming service providing comprehensive coverage from up to 15 courts.”

What is the BBC Ultra HD trial?

The Ultra HD trial is already featuring in the BBC’s World Cup 2018 coverage and is being extended to cover Wimbledon. It is part of ongoing work to help get the BBC ready for a future where major live events can be streamed freely over the internet in high quality on BBC iPlayer.

Audiences with a compatible TV and a high-speed internet connection will be able to access the coverage. However, there are a limited number of spaces for each match in this trial, with the live stream available to tens of thousands of people on a first-come, first-served basis. The Ultra HD stream will be clearly labelled on the BBC iPlayer home screen as soon as programme coverage begins.

Audiences will need a connection of at least 40Mbit/s for the full 3840 pixel Ultra HD or 20Mbit/s for 2560 pixel Ultra HD.

A full list of all UHD compatible devices please can be seen here.

Japan’s Naomi Osaka retired from her second-round match against Dalila Jakupovic in Birmingham with an abdominal problem.

Osaka, ranked 18th in the world, struggled on serve and lost the first set 6-3 before calling for the trainer.

She previously struggled with an abdominal injury during last year’s hard-court season.

Slovenian qualifier Jakupovic now faces Slovakia’s Magdalena Rybarikova in the Nature Valley Classic quarter-finals.

Rybarikova, who reached the Wimbledon semi-finals last year, overcame Kristina Mladenovic of France 3-6 6-2 6-1.

Second seed Elina Svitolina reached the last 16 in Birmingham for the first time with a 6-4 6-2 win over Alize Cornet of France.

The Ukrainian will play Romania’s Mihaela Buzarnescu on Friday, following her 4-6 6-3 6-2 win over Czech Petra Martic.

• Konta beaten by Kvitova in Birmingham
• Halep withdraws from Eastbourne
• Live scores, schedule and results

Osaka is scheduled to play in the WTA event at Eastbourne, which begins on 25 June.

Despite the injury, she hit nine winners against Jakupovic, but the big-hitting Slovenian broke to love in the seventh game.

Osaka was unable to capitalise on two break points in the next game and she struggled to generate power on her serve, eventually retiring after 33 minutes.

“It’s never nice to win when somebody’s injured. I feel sorry for her,” Jakupovic told Eurosport.

“I was trying to focus on my play and I didn’t really look on her side, but I hope she’s going to be better for her next tournament.”

At the WTA event in Mallorca, former world number one Angelique Kerber fell 5-7 6-2 6-1 to American Alison Riske, and French top seed Caroline Garcia beat Sweden’s Johanna Larsson 6-4 6-3.

Stan Wawrinka failed to convert 12 break points as he lost to Sam Querrey in the second round of the Fever-Tree Championships at Queen’s.

The Swiss, who has dropped to 261st in the world after injury, was beaten 7-5 6-7 (3-7) 6-1 by the American.

Wawrinka, a three-time Grand Slam champion, wasted seven set points at 5-4 in the first set and only capitalised on one of 13 break points in the match.

Querrey dominated on serve, hitting 25 aces as he closed out victory.

• Watch live BBC TV coverage from Queen’s Club
• Evans not awarded Wimbledon wildcard
• Murray on ’emotional’ return to tennis
• Live scores, schedule and results

Fifth seed and 2010 champion Querrey will face Croatian top seed Marin Cilic, who came from behind to beat Luxembourg’s Gilles Muller 4-6 6-3 6-3.

It was a battle of the big servers as the pair delivered 36 aces between them, with Cilic edging Muller 19-17.

American Frances Tiafoe reached his first ATP grass-court quarter-final with a 6-4 2-6 6-4 win over Leonardo Mayer of Argentina.

In the ATP grass-court tournament in Halle, French Open runner-up and third seed Dominic Thiem was stunned 6-2 7-5 by world number 52 Yuichi Sugita of Japan.

Seventh seed Kei Nishikori was also knocked out, with Russia’s Karen Khachanov beating the Japanese player 6-2 6-2 to go through to the quarter-finals.

Khachanov, who reached the fourth round at this year’s French Open, will next face Roberto Bautista Agut after the Spanish fourth seed beat Dutchman Robin Haase 4-6 7-5 6-4.

The top seed in Halle is Swiss eight-time Wimbledon champion Roger Federer, who plays Frenchman Benoit Paire on Thursday for a place in the last eight.