Hayden Shirley enters his second professional season and first with the ThunderBolts in 2014. He signed with Windy City on January 28, 2014. This is his second stop in the Frontier League after he split his rookie year between the Fort Worth Cats of the United League and the Rockford Aviators. He finished with a combined 5.79 ERA in 13 appearances. Shirley did his schooling at Harding University, where he went 13-16 with a 4.92 ERA in 43 games (39 starts) over four years. Hayden attended Marcus High School in Flower Mound, Texas.