Supple, a Northwestern Wildcats recruit, has a 27-0 record with a 0.79 ERA and 274 strikeouts entering Friday's Division 1 state semifinal against Kenosha Bradford/Reuther.
Sydney has 14 shutouts and four no-hitters this season. She is also a force at the plate, carrying a .540 batting average with 12 home runs, 47 RBI and 52 runs scored for coach Ken Dischler and the Spartans.
Sydney was named Fox Valley Association Player of the Year as a junior and senior. She received first-team WFSCA all-state as a junior.
Finalists for the award were Supple, Waukesha North's Maddy Anderson, Verona's Meghan Anderson, Monroe's Olivia Bobak, Mosinee's Sydni Gburek, Campbellsport's Alyssa Muench, Glenwood City's Maggie Wallin, and Belmont's Sadie Willborn.