Petra Kvitova ended the run of qualifier Jessica Pegula to set up a 2018 final rematch against Garbine Muguruza at the Qatar Open.
Kvitova saw off Pegula in straight sets, triumphing 6-4 6-4, meaning she will be involved in the final of the tournament for a third time in four years.
Having twice let slip breaks in the opener, the 2020 runner up edged ahead again at 5-4 before serving out for a 1-0 lead.
Pegula appeared set to draw level when she raced 3-0 ahead in the next, only to be pegged back by Kvitova, who hit 26 winners and the same number of unforced errors. Victory was eventually sealed after one hour and 18 minutes on court.
The two-time Wimbledon champion secured the trophy in Doha three years ago by beating Muguruza, who did not even have to hit a ball to progress on Friday after opponent Victoria Azarenka withdrew from their semi-final due to a back injury.
That title showdown in 2018 went the distance, Kvitova rallying after losing the opening set to eventually prevail.
"I think it's going to be a tough match," Muguruza said, according to the WTA Tour's official website.
"We played here in another final three years ago, so just looking forward to playing that match and hopefully getting the trophy."
The Spaniard has been in impressive form this week, ending Aryna Sabalenka's hopes of defending her crown in the last 16 before thrashing Maria Sakkari in a lopsided quarter-final.
Meanwhile, in Friday's action at the Lyon Open, second seed Fiona Ferro rallied from a set down to beat fellow Frenchwoman Clara Burel and reach the semi-finals.
Ferro's 2-6 6-1 6-3 triumph means she is certain to break into the top 40 in the world for the first time in her career.
The only other seed left in the draw is Paula Badosa, the Spaniard knocking out Kristina Mladenovic. Her reward is a last-four clash with qualifier Clara Tauson, conqueror of Camila Giorgi in straight sets.
Nadal goes the distance to reach Madrid Open last 16
Rafael Nadal battled to victory over three hours on the court against Pedro Cachin at the Madrid Open on Monday to seal a 6-1 6-7 (5-7) 6-3 win to reach the last 16.
The former world number one looked back to his best as he cruised through the opening set but was pushed hard in the second by Cachin.
Nadal came from behind to level at 5-5, but Cachin eventually sealed the set on his third set point.
The Spaniard then rallied in the third set, cutting down on his errors to regain control and advance to the fourth round at a tour-level event for the first time since 2022.
Nadal is one step away from booking his place in a 10th consecutive quarter-final in Madrid and will face Jiri Lehecka on Tuesday in the next round after the 30th seed overcame Brazilian qualifier Thiago Monteiro in two sets.
Medvedev fights back from the brink to beat Korda at Madrid Open
Daniil Medvedev overcame a stern test against Sebastian Korda at the Madrid Open on Monday, fighting back from the brink of defeat to seal a 5-7 7-6 (7-4) 6-3 win and reach the last 16.
The world number four was staring at an early elimination when Korda took the opening set and put himself within two points of victory on two occasions, at both 5-4 and 6-5 up in the second.
However, Medvedev twice held firm on his own serve to force a tie-break, and the pair exchanged mini breaks before the 2021 US Open champion seized control to take it 7-4.
Medvedev's performance was error-strewn in parts, but he found more consistency in the third set, claiming the all-important break eight games in after repeatedly testing Korda's forehand.
Medvedev will now face Alexander Bublik for a place in the quarter-finals on Tuesday after the 17th seed overcame Ben Shelton in three sets.
Data Debrief: Medvedev overcomes awkward opponent
Medvedev has not always had things all his own way against Korda, who eliminated him from the Australian Open and the Shanghai Masters in 2023.
Prior to Monday's match, he was 23-2 versus American players since the start of 2021, with both losses coming against Korda. However, having also beaten Korda en route to the Indian Wells Open final last month, he seems to have put that hoodoo behind him.
Swiatek storms into Madrid Open quarter-finals by crushing Sorribes Tormo
Iga Swiatek continued her march towards back-to-back Madrid Open finals by crushing home favourite Sara Sorribes Tormo in straight sets in the last 16 on Monday.
The world number one – who lost to Aryna Sabalenka in last year's final – made a poor start as Sorribes Tormo surprisingly broke her serve in the opening game, but that only spurred her into action as she dominated from there.
Swiatek broke back immediately and reeled off 12 straight games to advance 6-1 6-0, going one better than her 6-1 6-1 win over Sorana Cirstea in the last 32.
On clay, Swiatek has now won nine of her 55 WTA 1000-level sets by 6-0, with that remarkable rate of 16.4 per cent being the highest of any player to have played 10 or more sets in the format's history (completed matches only).
Swiatek will face Beatriz Haddad Maia in the last eight on Tuesday, with the Brazilian upsetting Maria Sakkari 6-4 6-4 to reach her first quarter-final at the event.
Data Debrief: Swiatek unstoppable on clay?
Swiatek's meeting with Haddad Maia will represent her 14th quarter-final in 18 WTA events played on clay, meaning she has reached that stage on 77.8 per cent of her appearances on the surface.
Since the turn of the century, only two players have a higher rate of quarter-finals reached on clay – Martina Hingis (85.7 per cent, 12/14) and Justine Henin (80.6 per cent, 25/31).
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