Colin Donnelly enters his first season with the Valley Blue Sox. In 27 appearances, one of them starts, the New Jersey native went 6-1 with 3.86 ERA with Quinnipiac University. He struck out 46 batters while walking just 16. Donnelly threw 7.2 innings of scoreless relief in the 2019 MAAC Championship, a game he and the Bobcats won in 13 innings. During his sophomore season, Donnelly led all Quinnipiac pitchers with a 2.53 ERA.