A tradition unlike any other: players leaving the Seattle Mariners and finding glory with other teams. Now, to be clear, the reason these guys got to play in the World Series is largely based on luck. Even if you do get way better after leaving the Mariners’ facility, the team you’re going to also has to be good at the right time and outlast other good teams in the playoffs.
Still, since 2010, 18 different players have thrown a pitch or stood in the batter’s box at the World Series with the title of “former Mariner”.