Daria Kasatkina and Margarita Gasparyan fended off two of the great stalwarts of Russian tennis to set up a final showdown at the St Petersburg Ladies Trophy.
Kasatkina recovered from a slow start to overcome fourth seed and two-time grand slam winner Svetlana Kuznetsova, after Gasparyan saw off former Wimbledon and US Open runner-up Vera Zvonareva.
Zvonareva, 36, and Gasparyan, whose promising career has been disrupted by injury, were both allocated wildcard entries to the tournament and seized advantage to reach the last four.
Gasparyan, a 26-year-old whose single-handed backhand is an unusual sight in modern tennis, came through the clash with Zvonareva a 6-3 7-6 (11-9) winner to reach her first final at WTA 500 level.
The world number 126 will tackle former top-10 star Kasatkina for the title, after the 23-year-old Barcelona resident scored a remarkable 1-6 6-0 6-2 win over Kuznetsova in the second semi-final.
It was a flat Kasatkina who surrendered the opening set, but she then dashed off eight games in a row, levelling the match and surging to a 2-0 lead in the decider, knocking the stuffing out of 35-year-old Kuznetsova's challenge.
Kasatkina, a 23-year-old with more variety than most, had also dropped the first set 6-1 in her quarter-final win over second seed Veronika Kudermetova on Friday before finding her best game.
She said on Amazon Prime: "Well, why not, if losing the first set will guarantee me victory, why not?"
Kasatkina, the eighth seed this week, won the Phillip Island Trophy in Melbourne last month so is chasing a second WTA title of the year.
She is relishing the clash with Gasparyan, saying: "It's cool to have players of different styles. Tomorrow's a final so you've just got to go out there and try to show your best tennis."
An all-Russian final was already guaranteed, given the host country locked down all four semi-final places, and it will be the 30th such WTA title match.
Osaka eliminated by Samsonova in Madrid
Naomi Osaka was knocked out of the Madrid Open by Liudmila Samsonova after an entertaining second-round battle on Thursday.
Having won her first match on clay for two years against Greet Minnen a day earlier, Osaka was able to force a final set against 15th seed Samsonova but ultimately fell to defeat.
Samsonova won a close encounter 6-2 4-6 7-5 to book a clash with American Madison Keys – who defeated Irina-Camelia Begu in straight sets – in the next round.
Osaka had beaten Samsonova at Indian Wells last month and came close to securing another victory as she recovered well from losing the opening set.
But the Japanese star was broken to fall 5-6 behind in the final set, and the Russian made no mistake in ruthlessly closing out the victory.
Data Debrief: Samsonova ends losing streak
This was a crucial win for Samsonova, who came into the match having lost four consecutive contests, including that Indian Wells defeat to Osaka on March 9.
Samsonova did apply plenty of pressure in the final set – forcing five break points compared to just one for Osaka – and was ultimately rewarded in the closing stages of a contest that lasted two hours and 22 minutes.
Azarenka makes history with 200th WTA 1000 win
Victoria Azarenka made light work of progressing into the round of 32 at the Madrid Open and she made history in the progress.
Azarenka, a two-time finalist in Madrid, despatched Tatjana Maria 6-3 6-1 on Thursday.
It brought up her 200th victory at WTA 1000 events, which makes her the first woman to hit that milestone since the format was introduced in 2009.
The former world number one needed just 81 minutes on court to get the job done, and will face Sara Sorribes Tormo in the next round.
Data Debrief
This was Azarenka's first meeting with Maria, and her service game was excellent, with the Belarusian winning 63.2 per cent of her first-serve points. She also saved five break points, having offered up seven, and converted six going the other way.
Azarenka, who has won 10 WTA 1000 events, is 14 clear of next-best Simona Halep (186) on the list of women with the most WTA 1000 match wins.
Raducanu stunned by qualifier Carle in Madrid
Maria Lourdes Carle made a splash at the Madrid Open on Wednesday, as the qualifier sent Emma Raducanu packing.
World number 82 Carle stepped into the void to fill in for Karolina Pliskova, who withdrew prior to the end of the qualifying rounds, to face 2021 US Open champion Raducanu.
It is just the second time Carle has reached the main draw of a WTA 1000 event, and she ensured it would be a memorable campaign after a 6-2 6-2 victory over Raducanu, who is now ranked at world number 221, though has enjoyed something of a return to form this season.
Raducanu reached the quarter-finals of the Stuttgart Grand Prix last week, going down to world number one Iga Swiatek, but has recently enjoyed victories over the likes of Angelique Kerber and Caroline Garcia.
Data Debrief
Carle is the first player from Argentina to defeat a former women's singles grand slam Champion since Nadia Podoroska overcame Serena Williams in Rome in 2021.
The 24-year-old is making just her sixth WTA main draw appearance, with her first WTA 1000 appearance having come in Miami in March.
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