The Mariners, Rays and Cardinals officially announced a three-team deal that sends infielder/outfielder Brendan Donovan to Seattle. The full breakdown is as follows:
- The Mariners send infielder Ben Williamson to the Rays, as well as prospects Jurrangelo Cijntje and Tai Peete and a competitive balance round B pick (#68 overall) to the Cardinals, receiving infielder/outfielder Brendan Donovan from the Cardinals.
- The Cardinals send infielder/outfielder Brendan Donovan to the Mariners, getting prospects Jurrangelo Cijntje and Tai Peete plus a competitive balance round B pick (#68 overall) from the Mariners, as well as receiving outfield prospect Colton Ledbetter and a competitive balance round B pick (#72 overall) from the Rays.