Sep. 13—YANKTON — The Mitchell High School boys golf team finished in eighth place at the Yankton Invitational on Friday afternoon at Hillcrest Country Club. As a team, the Kernels posted a score of 331, led by Marshall Widstrom’s 15th-place finish after shooting a round of 6-over 78. Following a double bogey on the par-5 first hole, Widstrom picked up 10 pars in a row, shooting 38 on …