NEWTON, Iowa (AP) — It took rookie William Byron just a week to get over one of the most brutal losses of his young career. The 19-year-old Byron grabbed the lead with just over 20 laps left and won the NASCAR Xfinity race at Iowa Speedway on Saturday night for his first series victory. A seven-time winner last year in the Truck Series, Byron broke through just a week after an agonizingly close loss to Monster Energy Cup star Denny Hamlin at Michigan. "Last week was just exciting to be that close to a win," said Byron, who won the Truck race at Iowa in 2016.Read more on NewsOK.com