 Estrada began the 2008 season with the Harrisburg Senators of the Double-A Eastern League, where he pitched 74⅓ innings in 13 starts, posting an ERA of 2.66, striking out 67 batters and walking 32.In June he was promoted to the Syracuse Chiefs of the Triple-A International League.He was called up to the majors on August 19 and made his debut the next day.