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Koch signed a minor-league contract with the Rockies on Nov. 22 and received an invitation to major-league spring training.
Koch spent the 2022 season with the Mariners, and struggled to an 8.31 ERA over 4.1 innings of work in four appearances. The right-hander has an outside chance of making the Rockies out of spring training with a strong showing in the Cactus League.
