Mariners selected the contract of RHP Blas Castano from Triple-A Tacoma.
Castano earns a spot on Seattle’s 40-man roster to shield him from next month’s Rule 5 Draft after posting a respectable 4.38 ERA, 1.37 WHIP and 108/43 K/BB ratio across 125 1/3 innings (29 appearances, 26 starts) between Double-A Arkansas and Triple-A Tacoma.
