Heavy rains this afternoon have forced postponement of Friday night’s “Border Wars” opener for the AMSOIL USAC National Sprint Cars at the Gas City (Ind.) I-69 Speedway. The race has been rescheduled for Friday night, April 27. “Border Wars” is now slated to start with Saturday night’s “Don Branson/Jud Larson Larson Classic” at the Eldora Speedway in Rossburg, Ohio.