Naomi Osaka did not raise a sweat en route to the Miami Open last 16 as Garbine Muguruza moved through but Sofia Kenin and Karolina Pliskova bowed out.
Australian Open champion and second seed Osaka benefited from a walkover after qualifier Nina Stojanovic withdrew ahead of Sunday's clash due to a right thigh injury.
Elise Mertens will face Osaka following the 16th seed's 6-2 0-6 6-2 win against Anett Kontaveit.
Two-time grand slam winner Muguruza rallied past Russian wildcard Anna Kalinskaya at the WTA Premier event.
However, fourth seed Kenin was sent packing as sixth seed Pliskova was tamed by nemesis Jessica Pegula in Miami.
MUGURUZA STAYS HOT
Spanish star Muguruza dug deep to earn her tour-leading 20th win of the season.
Former world number one Muguruza – the 12th seed – prevailed 4-6 6-3 6-4 against Kalinskaya, having trailed 3-0 in the final set.
"I brought my fighting spirit and I could match the level of fighting against Anna, and very happy to go through these tough matches," Muguruza said following two hours, 41 minutes on court.
"Doesn't matter if you play pretty or you play ugly, but you stay strong and you go through these rounds. That gives me an opportunity to feel better and to have another chance."
Muguruza – who has the most final appearances this season with three, having won the Dubai Tennis Championships and finished runner-up at the Qatar Open and Yarra Valley Classic – will next face eighth seed Bianca Andreescu.
Former US Open champion Andreescu overcame fellow seed Amanda Anisimova 7-6 (7-4) 6-7 (2-7) 6-4.
KENIN'S WOES CONTINUE
It has been a rough 2021 for American star Kenin.
Stunned in the second round of the Australian Open – in her title defence – Kenin then crashed out of the Phillip Island Trophy at the first hurdle.
Kenin rallied to beat Andrea Petkovic first-up in Miami, but the 22-year-old was beaten 6-4 4-6 6-4 by 27th seed Ons Jabeur.
Jabeur and Sara Sorribes Tormo – who shocked 21st seed Elena Rybakina 6-1 3-6 6-2 – will meet for a spot in the quarter-finals.
PLISKOVA FALLS TO PEGULA… AGAIN
For the third time this past month, 2019 Miami Open runner-up Pliskova went down 6-1 4-6 6-4 to 29th seed Pegula.
Australian Open quarter-finalist Pegula conquered Pliskova in Doha and Dubai before repeating the feat in Miami on Sunday.
"I played her a lot the last three weeks, three tournaments," Pegula said. "I kind of expected her to play well there. Even when I was up I still felt like she could easily come back just because she plays so aggressive and she serves well."
After reeling off the final four games, Pegula set up a last-16 showdown with 23rd seed Maria Sakkari, who dismantled qualifier Liudmila Samsonova 6-0 6-1.
Svitolina to face Rybakina after passing Bogdan test
Elina Svitolina will face Elena Rybakina in a marquee fourth-round tie at the French Open after successfully moving into the second week.
The Ukrainian defeated Ana Bogdan 7-5 6-2 on Saturday to reach the last 16 for the sixth time in her career.
Both players struggled on serve, with 11 breaks in total during the match, but it was Svitolina who ultimately emerged triumphant after a back-and-forth contest and a rain delay, firing 28 winners.
Fifteenth seed Svitolina will now hope to halt the Paris charge of fourth seed Rybakina, who is yet to drop a set at the tournament so far. It will be a tough ask, but Svitolina does lead the head-to-head 2-1.
An all-American clash between Madison Keys and Emma Navarro on Court Suzanne-Lenglen was one of the other standout matches.
Navarro had never before reached the fourth round at a major, while Keys was a former semi-finalist at Roland-Garros.
But it was Navarro who claimed a hard-fought victory, getting the better of two tie-breaks to win 7-6 (7-5) 7-6 (7-3) to book a huge clash against second seed Aryna Sabalenka.
Jasmine Paolini is also through to round four after seeing off former US Open champion Bianca Andreescu 6-1 3-6 6-0.
Mirra Andreeva, meanwhile, is the youngest player to reach the French Open last 16 since Nicole Vaidisova in 2006 after beating Peyton Stearns in straight sets.
The 17-year-old raced to a 6-2 6-1 win in only 67 minutes.
Sabalenka and Rybakina had earlier completed routine victories over Paula Badosa and Elise Mertens respectively.
Zverev edges Griekspoor in four-hour classic at French Open
Alexander Zverev reached the fourth round of the French Open with a thrilling five-set win over Tallon Griekspoor, finding a second wind after a stirring rally from the Dutchman.
Zverev triumphed 3-6 6-4 6-2 4-6 7-6 (10-3) at the end of a gruelling four-hour, 17-minute contest on Court Philippe-Chatrier, teeing up a last-16 meeting with Holger Rune or Jozef Kovalik.
Zverev looked to have weathered an early storm when he fought back after losing the opener to go 2-1 up, but Griekspoor refused to go away and came roaring back in the fourth set, which lasted almost an hour.
The world number four appeared to be up against it when he was broken in the first game of the decider, and his frustrations got the better of him as he yelled at the umpire before being broken again.
However, he immediately hit back with two breaks of his own to go from 4-1 down to 4-4, eventually forcing a decisive tie-break.
He found another gear from there, sapping Griekspoor's confidence with some excellent play at the net, with a fine passing shot past his stranded opponent a highlight before he clinched victory with an ace.
Data Debrief: Zverev gathering momentum
Having warmed up for Roland Garros by winning the Italian Open, Zverev has now won nine straight matches on clay for the first time since 2018, when he won 13 consecutive contests on the surface at Munich, Madrid and Rome.
Medvedev passes Machac test to reach French Open fourth round
Daniil Medvedev dug deep to hold off Tomas Machac's threat in the French Open third round, claiming a 7-6 (7-4), 7-5, 1-6, 6-4 victory on Saturday.
Medvedev was pushed all the way to a first-set tie-break but took the opener, spurred on by an electric atmosphere on Court Suzanne Lenglen, before storming through the second.
Machac, who shocked Novak Djokovic in the Geneva Open semi-final last week, refused to back down, and soared through the third set, though he could not hold onto his building momentum.
With the prospect of a deciding set creeping closer, Medvedev rallied and held off a stubborn Machac, gaining a decisive break in the 10th game of the final set before a mistake from the Czech gifted him the victory.
Medvedev, who is chasing a second major, will face either Alex de Minaur or Jan-Lennard Struff in the fourth round.
Data Debrief: Medvedev hits form on clay
Medvedev has a win percentage of 76 per cent on clay since 2023 in ATP events, compared to just 44 per cent on the same surface between 2016 and 2022.
The world number five has now reached the round of 16 for the 15th time in his career at Grand Slams; only Marat Safin, Mikhail Youzhny and Yevgeny Kafelnikov have reached the fourth round more often in Grand Slams amongst Russians.
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