Brad Keller's designation for assignment comes after a season plagued by inconsistencies, culminating in a 5.84 ERA with the Red Sox and a disappointing command record that showed alarming deterioration in his previous prowess as a reliable mid-rotation starter.
Keller, once a rising star in Kansas City with a 3.50 ERA over 360 innings, struggled significantly over the last few seasons and his command failures this year have been attributed to symptoms of thoracic outlet syndrome, following a surgery he underwent last summer.
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