KANSAS CITY, Mo. — Tyler Dorsey scored 20 points and made the go-ahead layup with 1:08 left, and third-seeded Oregon ended No. 7 Michigan’s dramatic postseason run with a 69-68 victory in a Midwest Regional semifinal on Thursday night. Dorsey, the man the Ducks call “Mr. March,” had his sixth straight game scoring 20 or more points. The Wolverines (27-11) had one more chance to extend their run after Dylan Ennis missed a free throw with 15 seconds left.