Sep. 10—SIOUX FALLS — It was a clean sweep on Monday for the Mitchell High School girls tennis team, winning 9-0 in a dual at Sioux Falls Roosevelt at Kuehn Park. The win improves Mitchell to 13-1 in duals this season, with a combined record of 109-17 in individual matches at duals so far this year. Mitchell won every match in straight sets on Monday, the Kernels’ ninth 9-0 win of the season. …