CHASTAIN 18th AT CHICAGOLAND JOLIET, Ill. – Ross Chastain racked up his sixth top-20 finish of the Xfinity Series season Sunday, scoring an 18th-place run in the Owens Corning AttiCat 300 at Chicagoland Speedway. Chastain replaced regular driver Landon Cassill, who took the weekend off, in the Gerbe...