Two-time American League Cy Young Award winner Corey Kluber announced his retirement on social media Friday morning, ending a 13-year career.

A three-time All-Star, Kluber won his first Cy Young with Cleveland in 2014 after going 18-9 with a 2.44 ERA. He won the award again in 2017, finishing 18-4 with a 2.25 ERA.