Walker, 21, has made 25 starts this season in AA Jackson and AAA Tacoma. At those two levels, Walker went 9-10 with a 2.93 ERA and averaged 10.19 strikeouts per 9 innings pitched.
At 21 years, 17 days, Walker will be the fifth youngest player in Mariners history to debut as a starting pitcher (the youngest was some 19-year-old named Felix). If the Mariners don't change the rotation, Walker would be scheduled to make his home debut on Sept. 9 against Houston.
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