Jill Martin scored 24 points with 11 rebounds to lead Norwalk to a53-39 victory over Spencer in a Class 3A first round game.
Martin, a Drake signee, was seven of 11 from the field and 9-of-10 from the free throw line.
Norwalk held a 39-37 lead with 5:45 remaining in the game before Norwalk used a 14-2 run to finish off the game.
Shelby Gierstorf added 10 points and 10 rebounds for Norwalk while Nicki Reed scored seven points.
Molly Kruse led Spencer with 11 points. Norwalk (23-2) advances to the Class 3A semifinals, facing either West Delaware or Cedar Rapids Xavier at 6:30 p.m. Thursday.
Spencer, making its first-ever state tournament appearance, ends its season at 17-8.