Elena Rybakina powered into the Ningbo Open final with a 6-3, 6-2 victory over Jasmine Paolini on Saturday that keeps her chances alive of qualifying for the WTA Finals.
Paolini could have secured her ticket to next month's season finale in Riyadh with success on Saturday.
But the Italian's defeat means the battle for the last two spots will be settled at next week's Pan-Pacific Open in Tokyo, with Mirra Andreeva also still in contention.
"I knew the match was going to be very tough," said Rybakina, who improved her head-to-head record against Paolini to 3-3.
"Jasmine has played really well this season and she's a really tough opponent, so I knew I would need to bring my best.
"I'm happy I stayed focused until the end and won it in straight sets."
Former Wimbledon champion Rybakina entered the semifinals having lost her last two meetings with Paolini but utilised her big serve and powerful groundstrokes to win in 90 minutes.
Rybakina fired 30 winners, including 10 aces, and saved all seven break points she faced to reach her second final of the season, where she will face fourth seed Ekaterina Alexandrova.
Alexandrova is celebrating her top-10 debut this week and moved into her fourth final of the year with a 6-3, 6-4 victory over fellow Russian Diana Shnaider.
In a rematch of the Monterrey final won by Shnaider earlier this season, Alexandrova benefited from 40 unforced errors from her opponent throughout the 92-minute showdown.
"I'm really happy with the result, being here in the final. I think it was a super difficult match today," said Alexandrova, who is through to the 13th WTA final of her career.
"I have no expectations. I will go on the court tomorrow and enjoy the atmosphere and the match.
"I will try to do my best because she is a great player and has a really tough serve, so it will be super difficult against her."