The world No.17 will play either Russian third seed Anastasia Pavlyuchenkova or Kazhak Zarina Diyas on Friday for a spot in Saturday's title decider.

Stosur and second-seeded Gavrilova share the same manager, same sponsor and were sharing the same outfit on the same court in their latest showdown.

Little wonder Gavrilova was left lamenting the same outcome as last year's final, too.

"It's tough to play a teammate and a friend. Unfortunately we've played way too many times this year, but we both go out there and try and do our best," Gavrilova said.

"Pretty much we don't have secrets. She knows me well, her coach knows me well and it's the same for me; I know her game pretty well."

Wednesday's was their third encounter in 2018, with Stosur again avenging her second-round loss to Gavrilova in Sydney with a second consecutive defeat of the 23-year-old on clay.

The former French Open finalist also beat Gavrilova in Prague this month, though the vanquished was forced to retire early in the deciding set after injuring her ankle.

This time Gavrilova conceded she had no answer to Stosur's ferocious firepower.

"She was playing well and she was serving huge today," Gavrilova said. "At first today, I was thinking this speed [clock] thing is not working.

"But then I compared her speed to mine and I thought she was playing really big today."

Barty's progression and the Stosur-Gavrilova sequel left the French press wondering if the Australians held their annual general meeting at the tournament.

"We play many tournaments all the same. But, for some reason, I think Australians like being here," Stosur said.

"And like last year, we're getting through the rounds, which is a good feeling, and hope we can keep it going."

AAP