Keller has been promoted to High-A after overwhelming the competition at Low-A West Virginia. The 20-year-old righty notched a 2.46 ERA and 131:18 K:BB in 124.1 innings.
Keller sparkled at Low-A, hitting his spots while also showing an exceptional ability to miss bats. Opposing batters hit a mere .211 against him. His breakout 2016 campaign has vaulted him into the elite pitching prospect conversation.