Sep. 13—MITCHELL — The Mitchell High School girls tennis team continued its strong season on Thursday. The Kernels picked up their eighth sweep of the season as they defeated Sioux Falls Washington 9-0 in their dual at Hitchcock Park, dropping only a combined 16 games between both singles and doubles competitions. In double competition, Megan Mastel and Carsyn Weich defeated Madelyn Dahlmeier …