MARSHALL — The Marshall A’s secured a walk-off victory over the Willmar Rails in a Corn Belt League game Friday night at Legion Field. Marshall scored twice in the bottom of the ninth to beat Willmar, which led 4-0 after the top of the fourth. The A’s answered with single runs in the fourth, seventh and eighth innings before their two in the bottom of the ninth. With two outs in the bottom of the ninth, a Cody Wichmann RBI single tied the game. …