Plesac is a right-handed pitcher who will turn 24 on December 28. He helped the Bulldogs win a sectional championship before graduating and moving on to pitch at Bethel University in Mishawaka. At Bethel, Plesac earned All-Region honors and was named to the All-Crossroads First Team. In his final season, he made 12 starts, threw two complete games, struck out 90 batters, and posted a 10.3 strikeouts-per-nine rate. 

Plesac transitioned quickly from college to professional baseball, signing with the Joliet Slammers of the Frontier League in 2024. He moved into the bullpen, appearing in 37 games, recording one save, and earning three wins. This past year, Plesac returned to Joliet, where he pitched in 26 games (including two starts), struck out 33 batters, and picked up three more wins. 

Frank Plesac comes from a long line of pitchers. His uncle, Dan Plesac, pitched in the Major Leagues for 18 seasons and is now an analyst for MLB Network. His brother, Zach Plesac, spent six years in the big leagues with the Cleveland Guardians and Los Angeles Angels. Zach is currently in the St. Louis Cardinals organization.