The Mariners and Yankees swapped young stars prior to the 2012 season, with Jesus Montero going to Seattle and Michael Pineda moving to New York.
Pineda was supposed to be a member of the Yankees' rotation for several years, while Montero would fill a spot in the heart of Seattle's lineup for a decade.
Neither player is in the Major Leagues today.
Pineda, who has not thrown a pitch since the trade, is still recovering from shoulder surgery.
Montero, who was demoted last week, is batting .208 with a .590 OPS and has thrown out one of 24 runners trying to steal.