Pusarla’s assured 22-20 21-10 win early in the day over Mia Blichfeldt allowed her to seal a place in the showpiece match in 43 minutes.
Marin later battled past a resolute Pornpawee Chochuwong 21-15 20-22 21-19 to turn into reality the blockbuster predicted and anticipated by many. The Spaniard leads their head-to-head 8-5.
The 19-year-old Thai, a three-time world junior champion, will take on No.1 seed Viktor Axelsen, who overcame Kidambi Srikanth 21-13 21-19 in a tussle of former champions to qualify for his sixth straight HSBC BWF World Tour final.
It set up an all-European contest in the category, with Kim Astrup/Anders Skaarup Rasmussen denying fellow Dane Mathias Boe and his second-seeded charges Satwiksairaj Rankireddy/Chirag Shetty in the day’s closing encounter.
The women’s doubles title match meanwhile, will be contended by Gabriela Stoeva/Stefani Stoeva and Tan Pearly/Thinaah Muralitharan – their first meeting – after they checked the runs of the No.1 and No.2 seeds respectively.
The Bulgarian sisters upset favourites Jongkolphan Kititharakul/Rawinda Prajongjai 21-16 21-14 to reach their third final in four seasons while Tan/ Muralitharan recorded their maiden triumph (10-21 21-14 21-16) over senior compatriots Chow Mei Kuan/Lee Meng Yean.
History Beckons France
The Stoevas will hope to be third time lucky after losing back-to-back finals in 2017 and 2018.