Top seed Raducanu has now won her first three matches since splitting with coach Francis Roig after a lacklustre second-round exit at January’s Australian Open.
She is now into a first semi-final since the Washington Open in July and victory will see her reach a first final since the US Open.
Raducanu will next face Ukraine’s Oleksandra Oliynykova, who claimed her first top-50 win against Chinese fourth seed Wang Xinyu to reach a first WTA Tour semi-final.
With temporary tattoos of bats across her face – a nod to Transylvania’s folklore and nature – Oliynykova saved 21 out of 23 break points against Wang to win 6-4 6-4.
Katie Boulter also triumphed on Thursday, beating Czech Linda Fruhvirtova 6-3 6-2 to reach the Ostrava Open semi-finals.
It is a first semi-final appearance for the 29-year-old Briton since she won the Paris Challenger title in May last year.
After struggling for consistency throughout 2025, Boulter split with long-term coach Biljana Veselinovic and hired Michael Joyce to help her freshen up her game.
She will face American world number 96 Katie Volynets for a place in the final in the Czech Republic.