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Tanner Swanson, who has been the Yankees’ catching coordinator since November 2019, is leaving to become the bench coach of the Mariners, The Post has learned.
Swanson will serve under Jason Kanzler, who was named Seattle’s manager earlier this week.
Swanson had gained a strong reputation since going from the Twins organization to the Yankees for helping the Yankees rise to the forefront of framing by their catchers.
