Karolina Pliskova has crashed out of the Abu Dhabi Women's Tennis Open in the second round, while Coco Gauff was also eliminated.
Third seed Pliskova suffered a stunning 6-2 6-4 defeat to Anastasia Gasanova, a qualifier ranked at 292 in the world.
Pliskova fell to defeat in only 75 minutes on Saturday, the first time she had lost to an opponent outside of the top 50 in over a year.
Gasanova, 21, beat Mona Barthel in her WTA main draw debut this week and went on to save five of the six break points she faced to record an even bigger upset against Pliskova.
"It was not me on the court," a stunned Gasanova said after winning in her first match against a top-100 player, booking a last-16 clash against Sara Sorribes Tormo.
"I was so sure of myself. I'm really happy right now.
"I'm really surprised, but when I woke up today, I thought, 'Why not? Why can't I win this match?'
"Actually, I thought I would lose in qualies or something like that, but I just kept pushing myself, like, I need to win and I want to win.
"I had a [2021] goal to be top 200, actually! I don't know if I did this today, but that's my goal.
"To play against a top-10 player is a great opportunity for me, and it's a great chance to show how I could play."
Pliskova, therefore, starts her year on a negative note, but there were no such problems for second seed Elina Svitolina, who was a 6-4 6-1 winner against Vera Zvonareva.
Last year's Australian Open finalist Garbine Muguruza cruised through with a 6-1 6-4 victory over Aliaksandra Sasnovich and sixth seed Elena Rybakina won in straight sets against Xiyu Wang.
Muguruza will face Maria Sakkari in an intriguing last-16 match next after the Greek ended the hopes of American Gauff with a comfortable 7-5 6-2 victory.
Top seed Sofia Kenin, who made two grand slam finals last year and won in Melbourne, will resume her campaign against Yulia Putintseva on Sunday.
Jarry defeats Paul to set up Zverev showdown in Italian Open final
Nicolas Jarry defeated Tommy Paul in three sets on Friday to set up a showdown with Alexander Zverev in the Italian Open final.
The men's world number 24 prevailed 6-3 6-7 (3-7) 6-3 in a little under three hours in Rome to reach his first ATP Masters 1000 final.
Jarry earned the only break of serve in the eighth game of the opening set, but Paul - who dropped just one set in four matches en route to this stage - hit back in the second.
Birthday boy Paul lost serve to trail 4-2 at one stage, but he produced one of the shots of the tournament at the ideal moment and soon dragged it back to 4-4.
A gruelling set concluded with Paul taking the tie-break 7-3, but Jarry was unperturbed and won the deciding set with his fifth match point to see off Paul in a gruelling contest.
Data Debrief:
Jarry is the third male Chilean in the Open Era to reach the singles final of the Italian Open after Marcelo Rios (1997-98) and Fernando Gonzalez (2007).
The 28-year-old registered 13 aces against Paul to his opponent's seven and hit 35 winners to 19 in a deserved victory.
Zverev ends Tabilo's dream run to reach Italian Open final
Alexander Zverev fought back from the brink to reach the Italian Open final on Friday, overcoming Alejandro Tabilo by a 1-6 7-6 (7-4) 6-2 scoreline in the last four.
Zverev was punished for a slow start as Tabilo took the opener within 32 minutes, but the German fought back in a one-hour, 15-minute slog of a second set.
The 2017 Italian Open champion put his foot down from 3-3 in the second-set tie-break, with Tabilo potentially feeling the effects of a fine run that included a last-32 upset of Novak Djokovic.
Zverev upped the intensity in the final set and won a huge 94 per cent of points behind his first serve as his opponent wilted, the third seed reaching the Rome final for a third time.
Data Debrief: Zverev draws level with Becker
Zverev will now face either Nicolas Jarry or Tommy Paul in Sunday's final, which will be his 11th at ATP 1000 Masters level.
That tally pulls him level with Boris Becker for most such finals by a German player since the format's 1990 introduction.
Sabalenka defeats Collins to set up Swiatek rematch
Aryna Sabalenka defeated Danielle Collins 7-5 6-2 to set up yet another meeting with Iga Swiatek at the Italian Open.
Having defeated Collins en route to the final of the Madrid Open, which she lost to Swiatek, Sabalenka repeated the trick with a straight sets win over the American in Thursday's semi-final.
And the Belarusian's reward will be an immediate rematch with Swiatek.
The duo have met 10 times, including in Madrid earlier this month, with Swiatek winning seven times and Sabalenka claiming three victories.
This will be Sabalenka's first appearance in the Italian Open final.
She is the sixth player, along with Simona Halep (2017), Dinara Safina (2009), Serena Williams (2013), Ons Jabeur (2022), and Swiatek (2024) to have reached the final of both Madrid and Rome in the same season.
Data Debrief: Perfect record
Collins is the only player against whom Sabalenka has registered six wins without a loss in WTA events, while only against Maria Sakkari and Elise Mertens does she have more wins in her career in such events (seven each).
The final will mark the fourth meeting on clay between Swiatek and Sabalenka as world number one and two, equalling Chris Evert and Martina Navratilova for the most meetings on the surface as the WTA's top-two ranked players.
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