Second seed Elina Svitolina crashed out of the Viking International in Eastbourne at the last-16 stage on Wednesday with a straight sets defeat to Elena Rybakina.
The world number five lost 6-4 7-6 (7-3) to 21st-ranked Rybakina, whose reward is a meeting with Coco Gauff's conqueror Anastasija Sevastova in the quarter-finals.
Third seed Bianca Andreescu of Canada also lost in straight sets, Anett Kontaveit of Estonia beating her 6-3 6-3.
And it was the same story for fourth seed Iga Swiatek, though she at least took a set as she was beaten by Daria Kasatkina.
It took an impressive rally from Russia's Kasatkina to bounce back from losing the first en route to a 4-6 6-0 6-1 success.
She will now face Jelena Ostapenko, who beat Ons Jabeur 5-7 6-4 6-3.
In fact, top seed Aryna Sabalenka was the only seed to avoid a surprise exit on Wednesday as she cruised through.
The Belarussian, ranked fourth in the world, beat Alison Riske 6-1 6-4 in just over an hour to set up a clash with Camila Giorgi.
Giorgi had earlier followed up a win over defending champion Karolina Pliskova in the last round by beating Shelby Rogers 6-3 4-6 6-2.
There was no such string of shocks at Wednesday's other WTA event, the Bad Homburg Open in Germany, though first and second seeds Petra Kvitova and Victoria Azarenka needed three sets to progress.
Kvitova lost a second-set tie-break as she beat Ann Li 6-2 6-7 (4-7) 6-1 to reach the quarters, while Azarenka defeated Alize Cornet 6-4 3-6 7-6 (9-7).
Angelique Kerber, the fourth seed, progressed more smoothly, earning a comfortable 6-0 6-2 win over Russia's Anna Blinkova.
And Nadia Podoroska saw off the challenge of Patricia Maria Tig, winning 7-6 (7-4) 2-6 6-4.
Kvitova triumphs in Miami Open to dash Rybakina's Sunshine Double hopes
Elena Rybakina's superb run in the United States was ended by Petra Kvitova, who won 7-6 (16-14) 6-2 to clinch the Miami Open title.
Two-time grand slam champion Kvitova, 33, became the second-oldest Miami champion, denying young gun Rybakina a Sunshine Double in the process.
Rybakina, fresh from her triumph at the Indian Wells Open, has been in stunning form but could not find her groove on Saturday.
After clinching the first set following a marathon tie-break, Kvitova took momentum into the second, cruising into a 5-2 lead before sealing the win with a break – Rybakina sending a forehand long.
Kvitova equalled Simona Halep as the players with the third-most WTA 1000 titles (nine), with only Serena Williams (13) and Victoria Azarenka (10) having won more since 2009.
"It feels unbelievable. I'm 33, and it's my 30th title, so I'm very happy," Kvitova told Amazon Prime Sport.
"I didn't think, that was the key. Elena didn't lose a tie-break [this season]. I thought, well, she has to lose at some time. I had to be a bit more aggressive, it was a bit of a struggle. I was a bit nervous, yes.
"I would have laughed [if someone told me I was going to win] but it feels great for sure. Nobody expected this, not me, not my team. I'm happy I'm injury free and, oh my God, I made it."
Kvitova is the second woman to win the singles title in Miami after turning 33, following Serena Williams in 2015.
Indeed, only Serena Williams (68), Justine Henin (42), Venus Williams (40), Kim Clijsters (40) and Maria Sharapova (36) have more WTA singles title to their name in the 21st century than the Czech.
Rybakina, meanwhile, will lament the chance of a Sunshine Double going begging.
The 23-year-old is the fourth player to fail to win the Sunshine Double in Miami's final after Serena Williams (1999), Lindsay Davenport (2000) and Sharapova (2006 and 2013).
"I want to congratulate Petra for a great two weeks here in Miami, and good luck for the rest of the year," said Rybakina. "Thank you to my team, we'll keep going."
Sinner snaps Alcaraz's win streak, books Miami Open final against Medvedev
Jannik Sinner is through to the Miami Open decider after eliminating world number one Carlos Alcaraz 6-7 (4-7) 6-4 6-2 in Friday's semi-final.
Sinner, 21, has enjoyed a terrific start to 2023. Since the beginning of the Australian Open, the Italian has only lost three matches – to Stefanos Tsitsipas, Daniil Medvedev and Alcaraz.
He avenged his defeat to Tsitsipas with a straight sets win at the Rotterdam Open, and he has now got one back on Alcaraz after their three-hour war of attrition.
Both players created exactly 12 break point opportunities, and Sinner's 26 unforced errors were only one less than Alcaraz's 27, but the Spanish 19-year-old committed an uncharacteristic nine double faults. The loss snapped Alcaraz's 10-match winning streak.
The victory gives Sinner his second appearance in the Miami Open final after losing the 2021 edition to Hubert Hurkacz, and he now joins Rafael Nadal and Novak Djokovic as the only players to ever reach the final here twice before turning 22.
Sinner will get a chance to avenge his only other loss this year in the final after Daniil Medvedev booked his spot with a 7-6 (7-5) 3-6 6-3 victory over Russian compatriot Karen Khachanov.
Incredibly, Khachanov lost despite hitting 53 winners and only 11 unforced errors, and he ended up edging the total point count 93-88, but he could only convert two of his six break point opportunities, while Medvedev converted two out of four.
The win means Medvedev is the first player since Roger Federer in 2019 to reach the final of both the Indian Wells Open and the Miami Open in the same season, and he is the first since Federer in 2006 to reach five ATP finals before the clay court season begins.
Kvitova defeats Cirstea to join Rybakina in the Miami Open final
Petra Kvitova is through to her 41st WTA singles final after defeating Sorana Cirstea 7-5 6-4 in Friday's Miami Open semi-final.
Kvitova, 33, already has 29 singles titles under her belt, including eight at the WTA 1000 level. Despite showing she can still compete with the best – making the final at the 2019 Dubai Championships, the 2020 Qatar Open and the 2022 Cincinnati Open, her last WTA 1000 victory came at the 2018 Madrid Open.
Against Romania's Cirstea – who came into the contest with nine wins from her past 10 matches – Czech veteran Kvitova was put on the back foot early as her serve was broken to go 5-2 down.
But she saved two set points, and used that momentum to ignite a run of seven consecutive games, taking the first set and the early break in the second as a result.
Kvitova did not allow Cirstea to produce a single break point opportunity in the second set, winning 75 per cent (21-of-28) of her total service points to slam the door shut.
With the win, Kvitova joined Chris Evert and Serena Williams as the only women to ever reach the Miami Open final after turning 33 years old, booking her place against the hottest talent on the tour – Elena Rybakina – in the decider.
Rybakina has won her past 13 matches, and is looking to become the fifth woman to ever complete the Sunshine Double after eliminating both world number one Iga Swiatek and world number two Aryna Sabalenka to lift the Indian Wells Open title.
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