Daniil Medvedev was ousted from the Indian Wells Masters, the US Open champion and top seed stunned by former world number three Grigor Dimitrov in a thrilling comeback.
Dimitrov had been a set and a double break down against the Russian star on Wednesday, before launching a remarkable rally for his first win over a top-two opponent since 2016.
Meanwhile, second seed Stefanos Tsitsipas and third seed Alexander Zverev both won to secure their spots in the last eight.
MEDVEDEV SHOCKED IN THE DESERT
Dimitrov roared back to triumph 4-6 6-4 6-3 over Medvedev, who had won 18 of his past 19 matches on North American soil.
Bulgarian star Dimitrov trailed 4-1 in the second set after dropping the opener before stunning the first-time grand slam champion midweek.
"I just felt something at 1-4 and I calmed myself down and started to take better decisions and started to control the pace of the game, which I really believed helped me," Dimitrov – the 23rd seed – said. "In the end it was just very solid and smart play."
Dimitrov finished the match with 25 winners, while he was also excellent at the net, helping him claim his first quarter-final appearance at an ATP Masters 1000 event this season.
Medvedev sent down 5-1 aces but only managed a 54 per cent first-serve percentage, while he also faced 10 break points across the match. Dimitrov won five games in a row to claim the second set.
"I don't remember myself losing three service games, even four service games ever, I guess, on hard courts," Medvedev said.
"That shows how slow this court is and the conditions, more like clay, I would say, which I don't like, because to lose serve four times is just unacceptable."
Dimitrov will face eighth seed Hubert Hurkacz in the quarter-finals after he got past Australian Open semi-finalist Aslan Karatsev 6-1 6-3.
Medvedev added: "Grigor played [the] second part of the match better than anybody did against me [at the] US Open that I won. Playing this level, I don't see him losing to anybody, but let's see the result."
ZVEREV MAKES STATEMENT WITH MONFILS WIN
Olympic Games gold medallist Zverev bulldozed his way past 14th seed Gael Monfils 6-1-6-3 en route to the last eight.
German star Zverev claimed his 20th win from his last 21 matches, needing just over an hour to dispatch Monfils.
Zverev claimed 19 of 25 points at the net, hitting 19 winners including 11 with his forehand, while converting four of eight break points.
"I felt well on the court today. Gael is someone I haven't beaten before, so I knew had to play my best tennis and I definitely was not far away," Zverev said during his on-court interview.
Zverev will take on American 31st seed Taylor Fritz, who defeated 10th seed Jannik Sinner 6-4 6-3.
TSITSIPAS OUTLASTS DE MINAUR
French Open runner-up Tsitsipas saw off a tough challenge from Australian Alex de Minaur to secure his spot in the quarter-finals 6-7 (3-7) 7-6 (7-3) 6-2.
Tsitsipas fought back from a set down to win against the 22nd seed, triumphing in two hours, 43 minutes.
Greek star Tsitsipas showed grit to outlast the tiring De Minaur and will face 29th seed Nikoloz Basilashvili after he knocked off fellow seed Karen Khachanov 6-4 7-6 (8-6).
"That was incredible the way I just stayed in the match," Tsitsipas said. "I had to go through so many difficulties in order to find a solution and I executed towards the end of the match."
There were further top-10 casualties, with sixth seed Casper Ruud also bowing out 6-3 6-3 to 11th seed Diego Schwartzman, who will meet Cameron Norrie in the quarters.
Klaasen masterclass sees South Africa coast in third ODI to tie series
Heinrich Klaasen brilliantly took the third ODI away from West Indies with his unbeaten century to give South Africa a four-wicket win and tie the three-match series.
Klaasen scored 119 off just 61 deliveries, completing a routine victory with three consecutive boundaries.
There were still 123 balls remaining, with South Africa's number five batter having accelerated the scoring just as the tourists had recovered some hope at Senwes Park in Potchefstroom.
The Windies were all out for 260, losing their way after a strong start from Brandon King (72) lifted them to 110-1 in the 19th over.
King contributed to his team's downfall when he chose not to run and left partner Shamarh Brooks (18) stranded, slipping in the middle of the pitch for a run out that triggered a steady stream of Windies wickets.
It was still no sure thing the Proteas would chase down their target despite scoring at a good rate, losing four wickets inside 13 overs – including that of captain Aiden Markram for 25.
Yet Klaasen came to the fore, bringing up his hundred off just 54 balls to swiftly bring the finish line into sight.
A showstopping finale saw poor Yannic Cariah punished, conceding 49 runs off only three and a half overs as the Windies' hopes of a rare series win against South Africa were wiped out.
Windies' wait for series win goes on
West Indies have not beaten South Africa in a multi-game ODI series since April 1992, but this represented a real opportunity, leading 1-0 ahead of the final match after the opener was abandoned without a ball bowled.
A failure to capitalise on competitive starts to both innings extended that wait, although the Windies at least ended South Africa's run of seven straight series victories.
Klaasen crashes six after six
Coming into this match, South Africa had hit only 70 sixes in ODIs since the start of last year, compared to 143 for West Indies over the same period.
But Klaasen alone matched the Windies in that regard on Tuesday, smashing five maximums – as many as the entire touring team – to go with 15 fours in South Africa's fourth-fastest ODI century.
Navratilova reveals she is cancer-free as BJK welcomes 'wonderful news' and Haas hails 'icon'
Martina Navratilova has announced she is cancer-free, with Billie Jean King welcoming the "wonderful news".
Doctors believe the 66-year-old tennis great has beaten cancer for a second time, after previously overcoming breast cancer in 2010.
The Czech-American announced in January she had been diagnosed with throat and breast cancer, sparking an outpouring of well-wishes.
She is one of the most decorated players of all time, having won 18 grand slam singles titles between 1978 and 1990, plus a staggering 41 doubles slams.
Speaking to Piers Morgan on TalkTV, Navratilova said: "As far as they know, I'm cancer-free."
According to The Sun, Navratilova will have further preventative radiation treatment on her breast.
"Then I should be good to go," she said.
King, her friend and former tennis rival, was thrilled to learn Navratilova's health has taken a turn for the better.
She wrote on Twitter: "Such wonderful news from my dear friend, @Martina. We are so happy for you!"
Speaking to Stats Perform prior to Navratilova's announcement, former ATP world number two Tommy Haas spoke of his admiration for the legendary left-hander, and wished for a full recovery.
"What she has done in women's tennis and her success, the way she also kind of showcased her athleticism, her focus, her dedication to the sport, the records that she's broken, the longevity of it too," Haas said, listing reasons to be an admirer.
He described her as "an icon on the tour", and hoped she would survive this year's worrying cancer scare.
"Obviously, when you read the news about anyone in the tennis world that has had some kind of impact, or a great career, it's always sad, and you send them a text message, and you wish them the best and a speedy recovery," said Haas, the Indian Wells Open tournament director.
"You hope that they found these situations early, just like with Chris Evert [who recovered from ovarian cancer], and that they get through this and that they have the loved ones and friends around them and support them and get back to what they enjoy doing in life.
"I think we all know, and realise that without health, you have nothing. It's nice to be a part of certain things that you're passionate about. And it's important, and it's great, but being healthy and doing the things that you want to do ultimately, is really what it comes down to."
Will Still harbours Premier League ambition and may follow Vincent Kompany route
Will Still has ambitions to manage in the Premier League and would be open to following a similar route to Vincent Kompany by moving to a Championship club.
The 30-year-old has been one of the most talked about coaches in European football this season after doing a fine job with Ligue 1 side Reims.
Taking over from Oscar Garcia in October, Reims embarked on a club-record 19-game unbeaten league run until a 2-1 reverse at home to Marseille on Sunday – with Still taking charge for 17 of those.
Still, whose only other defeat as boss was in the Coupe de France, was brought up by English parents in Belgium before moving to England as a teenager where he studied to become a coach.
His name was mentioned for recent managerial posts at Leeds United and Southampton and, while he believes it is too soon to have been touted for such positions, Still would love a crack at England's top flight one day.
"It just seems completely stupid to me that my name is being put up against names that have done so much more and have been so many more places than I have," he told Sky Sports.
"I wouldn't ever dare to compare myself to those people.
"I've never really thought about it [managing in the Premier League] because I never expected to be in the position I am so early and so suddenly. Why not? I've done some crazy things in the past; I was head coach at 24 and the same thing happened at 28 back in Belgium and now I'm 30 and people are saying this is crazy.
"Being English and growing up in an English environment in Belgium, England has always felt like home and a place that I'd love to go back to. It would feel like coming home, just because the English culture is part of me, part of my roots, part of my family, part of who I am.
"I think if you asked any kid what they would like to do, they'd say they'd love to be a Premier League footballer or manager and I'm no different. I was brought up like everyone else and had the same dreams. I'll keep at them.
"If it happens one day I'll deserve it, or I hope I will have deserved it, but I realise how much work there is to do before I get there and how much I've got to learn. For now, I will stick it to one side."
Up until recently, Reims were having to pay a €25,000 fine every time Still took charge of the first team as he did not have a UEFA Pro Licence, but he is now on a course to get his badge.
Still believes that has amplified the interest in his story along with a comment he once made about the popular computer game Football Manager, that he says was misinterpreted.
"With the Football Manager thing, for example – people think I'm some spotty geek behind my computer that's just been dropped in at Stade de Reims and is doing an unbelievable job," he explained. "But I've been doing it for 10 years and the experiences I've accumulated or tried to accumulate have helped me and are still helping me today.
"People say, 'Oh, he's got no coaching badges, no qualifications, he's just played computer games!' I went to university to study football coaching, I've got the highest level diploma you can get, for the moment, in football and I'm studying for the Pro Licence."
In terms of the future, Still remains open to different career paths and mentioned how former Manchester City captain Kompany has excelled with Championship leaders Burnley after leaving Anderlecht as a potential example to follow.
"Vincent Kompany was at Anderlecht last year and has gone into the Championship and has done an unbelievable job. I think the Championship rivals many of the top leagues in the world," he said.
"All the doors are open. I'm not closing anything at any time."
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