Yes, the Seattle Mariners have won multiple playoff series in their history.
Despite being the only active Major League Baseball (MLB) franchise never to have appeared in the World Series, the Mariners have achieved success in earlier rounds of the postseason. They have earned five postseason berths throughout their history, a journey that has seen them achieve winning records in 18 seasons against 30 losing seasons.
Mariners Playoff Series Victories
The Mariners have won three American League Division Series (ALDS) in their franchise history, allowing them to advance to the American League Championship Series (ALCS). While they have made it to the ALCS on three occasions (1995, 2000, 2001), they were unable to secure a victory in any of those series, thus preventing an appearance in the World Series. After the Washington Nationals won the National League title in 2019, the Mariners remain the only active MLB franchise never to have appeared in the World Series.
Below is a summary of the Seattle Mariners' postseason appearances and their outcomes, highlighting their series victories:
| Year | Postseason Round Reached | Series Won? | Specific Series Won (if any) |
|---|---|---|---|
| 1995 | American League Championship Series (ALCS) | Yes | AL Division Series (vs. New York Yankees) |
| 1997 | American League Division Series (ALDS) | No | N/A |
| 2000 | American League Championship Series (ALCS) | Yes | AL Division Series (vs. Chicago White Sox) |
| 2001 | American League Championship Series (ALCS) | Yes | AL Division Series (vs. Cleveland Indians) |
| 2022 | American League Wild Card Series | No | N/A |
As shown, the Mariners demonstrated their capability to win critical playoff matchups, particularly in the Division Series, on multiple occasions.
