Coleman spent the 2015 season at Triple-A Omaha in the Royals' organization, posting a 4.92 ERA with 54 strikeouts and 41 walks over 82.1 innings of work. He did not receive an invite to the Mariners' spring training and will likely start the 2016 campaign at Triple-A Tacoma.
Mariners' Casey Coleman: Signs minor league deal with Mariners
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