Here are a few ways to rewrite this title in Swedish, depending on how strictly you want to mirror the original phrasing:
Option 1 (Closest to the original structure):
Regn tvingar Speedway GP-semifinalerna och finalen att ställas in i Vojens
Option 2 (More natural, concise news headline):
Regn stoppar Speedway GP-semifinalerna och finalen i Vojens
Option 3 (Using ”avbrytas” for abandoned):
Regn avbryter Speedway GP-semifinalerna och finalen i Vojens
Option 4 (If you prefer the possessive style):
Regn tvingar Speedway GP:s semifinaler och final att ställas in i Vojens
Recommendation:
Option 1 or Option 2 are the most standard and natural-sounding Swedish headlines. Option 1 keeps the ”force… to be abandoned” logic, while Option 2 is punchier and perfect for a sports ticker.