Walker is a top pitching prospect of the Mariners. He was 9-10 in the Minors last season but with a 2.93 ERA in 25 combined starts at Double-A and Triple-A. He struck out 160 hitters in 141.1 innings. He had a successful Major League debut in three late-season starts (1-0, 3.60).
Walker projects to make the Mariners' rotation as soon as he is ready, and with Felix Hernandez and Hisashi Iwakuma, Walker could make for a very formidable front end of the rotation, especially with Fernando Rodney now protecting leads and closing games for the Mariners.
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