Ken Griffey, Jr.
On July 26, 2016, Storen was traded to the Seattle Mariners for Joaquín Benoit. The Mariners were Storen's childhood favorite team, as he idolized Ken Griffey, Jr. Storen appeared in 19 games for the Mariners, pitching 18 innings and attaining a 3-0 record with a 3.44 ERA.