Brad Keller was a staple on the Kansas City Royals' pitching staff to open his Major League career, spending his first six seasons in Kansas City. Keller flashed potential during his run with the Royals, but never quite had the consistency that cemented his spot in the starting rotation. After a forgetful 2024 campaign with the Boston Red Sox and Chicago White Sox, Keller snuck his way into spring training with the Cubs this past season as a non-roster invite.
The Cubs have made a habit of turning rejected arms into bullpen success stories, and that turned out to be the case for Keller in 2025.