The 21-year-old was the Pirates’s fourth round pick (108th overall) in the 2020 First-Year Player Draft.
“Jack hasn’t been pitching for very long but already shows very promising stuff with a fastball/slider combination that we believe has a chance to be very effective at the professional level,” said Pirates General Manager Ben Cherington. “He’s a strong, physical pitcher with strong character and work ethic. We look forward to working with Jack in a Pirates uniform.”
Hartman went 1-0 with four saves, a 3.00 ERA (12.0ip/4er) and 22 strikeouts in 10 relief appearances in his senior season at Appalachian State (NC) University. Prior to pitching for Appalachian State, Jack played for the College of Central Florida and Tallahassee Community College.