Swanson was optioned to the Mariners' alternate training site Saturday.

EDGE Analysis

Swanson cruised to a 2.84 ERA and 0.63 WHIP in 6.1 spring innings, but that evidently wasn't enough to earn an Opening Day roster spot. With a career 6.58 ERA in 65.2 major-league innings, Swanson will presumably fill a low-leverage role if and when he returns to the majors.