Qualifier Liudmila Samsonova continued what she described as an "unbelievable" run by upsetting Victoria Azarenka to seal a place in the bett1open final in Berlin.
The world number 106 reached her first career final by beating two-time major champion Azarenka 6-4 6-2, having impressively seen off Madison Keys in the last eight.
It took just 66 minutes for Samsonova to win as she put on a powerful display of hitting on Saturday, firing down 11 aces.
The 22-year-old did not lose serve in the match and is the first qualifier to reach a WTA 500 final this season.
"It's all incredible for me, it's so new, and I'm very happy for it," Samsonova said amid a week that will give her a rankings surge.
"It’s unbelievable for me. It is the most important [week] of my life up to this moment.
"I'm sure it’s going to be a tough match because [Bencic] plays very good on this surface, and she's a good player. I will try to do my best and focus on my game, and we will see."
Fifth seed Bencic battled to a 7-5 6-4 victory over Alize Cornet in her last-four clash and will go into the final as favourite.
While the win came in straight sets, it was a hard-fought encounter, with Bencic winning all four of her break points while Cornet forced 10 but only converted two, which proved to be the difference.
Bencic, who will be encouraged ahead of Wimbledon, has now made four grass-court finals in her career and will seek her first WTA Tour title since October 2019 on Sunday.
The Swiss star, who had 29 winners and just 19 unforced errors against Cornet, lost to Iga Swiatek in Adelaide earlier this year in her only final appearance since that last title.
"I always try to play as many tournaments on grass as possible because I just love the surface," Bencic said.
"Of course it gives me a lot of confidence. It's always great to have this confirmation on grass that it is working well."
Alcaraz begins Madrid Open campaign with emphatic win
Carlos Alcaraz continued his fine record at the Madrid Open with an emphatic 6-2 6-1 victory over Alexander Shevchenko on Friday.
The two-time defending champion made it 12 straight wins at his home tournament to ensure he will face Brazilian Thiago Seyboth Wild in the last 32.
Alcaraz was playing his first match on the ATP Tour since March 28 after being unable to compete in the Monte-Carlo Masters and Barcelona Open due to an arm injury.
But he was still able to make a fine start to his clay-court season, breaking serve in the first game and racing to victory in only one hour and eight minutes.
Data Debrief
Sometimes the scoreline can be harsh on a beaten player, but on this occasion Alcaraz was clearly dominant, breaking the Kazakh seven times in the match and forcing 11 break-point opportunities while conceding only three for his opponent.
That allowed the Spaniard to claim a dominant victory despite being broken once in each set. He will now turn his attention to a clash with Seyboth Wild, who battled past Lorenzo Musetti with a 6-4 6-4 win.
Reigning champion Sabalenka pushed by Linette at Madrid Open
Aryna Sabalenka got her Madrid Open campaign started with a 6-4 3-6 6-3 win over Magda Linette on Friday.
Sabalenka could not quite hit her peak form against Linette, but the world number two nevertheless got the job done after going the distance.
The Belarusian is hunting a record-equalling third title in Madrid, where she is the reigning champion, though she has not won back-to-back matches at a tournament since winning the Australian Open.
"It's not about being confident," Sabalenka said. "It's about how much you're ready to do to get it. It's about the hard work and to be ready, be ready for the big fights. I feel like confidence is not going to help you in those big matches. It's about staying there and fighting for it."
Data Debrief
Sabalenka (70 per cent, 56-24) is now one of five active players since 2020 to hold a winning percentage of 70 per cent or higher at WTA-1000 events.
Iga Swiatek, Simona Halep, Elena Rybakina and Jessica Pegula are the other players to feature on that list.
Rybakina continues clay winning streak with victory over Bronzetti
In-form Elena Rybakina has moved into the last 32 of the Madrid Open after a straight sets victory over Italian Lucia Bronzetti.
Number four seed Rybakina triumphed 6-4 6-3 on Friday and will next face either Marta Kostyuk or Mayar Sherif.
Rybakina was broken early in each set but ultimately had few problems getting over the line, converting four of her five break points to continue an impressive run of results after winning the Stuttgart Open last week.
She has now won five consecutive WTA matches and has 13 straight wins on clay courts to her name in a superb streak that started one year ago.
Data Debrief: Rybakina in elite company
Since the start of 2020, only two other players have claimed as many 13 consecutive WTA wins on clay, and they are Iga Swiatek and Simona Halep, so Rybakina is in elite company.
Rybakina's last defeat on this surface came in the 2023 edition of the Madrid Open, when she fell to Anna Kalinskaya in her first match, so this win represented a better start to her campaign in the Spanish capital.
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