Willman made 15 appearances with 10 starts this past spring, while recording 64 strikeouts in 62.1 innings pitched. His strikeout total led the Western Illinois team and he also led the Summit League with a 9.24 strikeouts per game average. As a freshman, Willman appeared in seven games and made two starts.
Willman attended Oshkosh West High School where he was an All-Conference First Team, All-District First Team, All-State Honorable Mention and Team MVP his senior season. In 60 innings as a senior, he struck out 108 batters. Willman is a native of Oshkosh, Wisconsin.