Assen, Netherlands - Britain's Jamie Chadwick and Dutch rival Beitske Visser will fight for the inaugural all-female W Series title at the final race of the season at Brands Hatch next month after Finnish driver Emma Kimilainen won at Assen on Saturday.
Championship leader Chadwick finished third in the season's penultimate round at the Dutch circuit to move 13 points clear of Visser, who was a close fourth.
The result means Chadwick will take the title, and the $500 000 (R6.98m) winner's prize, if she finishes her home race in the top three.
Kimilainen, who had missed the last two rounds at Zolder and Misano on health grounds following a collision in the opening round at Hockenheim, started on pole but made a slow getaway with Britain's Alice Powell leading into the first corner.
The safety car was then deployed after South African driver Tasmin Pepper spun and collected an unfortunate Miki Koyama, with both drivers retiring.