Then will be part of the Mariners' 60-man training roster.

The Mariners essentially added all of their top prospects, including Then, along with members of the 40-man roster. Then, who was acquired last summer from the Yankees for Edwin Encarnacion, has only logged three starts at Low-A (2.25 ERA, 0.69 WHIP) so he probably won't see any MLB action in 2020.

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