Brad Sweet dominated last night’s 20th Annual Osky Challenge at the Southern Iowa Speedway in Oskaloosa and collected $20,000 for his efforts. Sweet cruised through lapped traffic and by the time runner-up Kerry Madsen closed to within a half second it was too late. Ian Madsen, Pennsylvania driver Brent Marks, and Rico Abreu completed the top five. The drivers get a night off as Southern Iowa Speedweek get set for the four biggest nights of sprint car racing…the 55th Annual F-V-P Knoxville Nationals starting tomorrow. AM 1320 and 95.3 KNIA will have complete coverage all four night starting with Live Track Side at five, M-R-N’s Winged Nation at six, and Race Nights Live at seven.