Walker, 21, was shut down at the end of February with right shoulder inflamation. Sports Injury Alert last updated Walker's situation when he made his first rehab start on April 5. During the off-season, the Mariners had several offers for Walker as they sought to upgrade their offense and rotation. Nothing came of it; the Mariners elected to keep the young pitcher who was ranked sixth in MLB's list of top 2014 prospects.
A first-round draft pick in 2010, Walker made his major-league debut on August 31, 2013, going five innings. He made two more solid starts in September, posting a 3.60 ERA with 12 strikeouts and 4 walks.
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