The Best Seattle Mariners Seasons and Every October Run
The Seattle Mariners' best seasons by record and all 11 postseason series from 1995 to 2025, from the 116-win team of 2001 to the seven-game ALCS of 2025, with the near-misses that define the club.
The Seattle Mariners are the one American League club with no pennant. They began play in 1977, and through the 2025 season the historical record shows 49 seasons, a record of 3,689 wins and 4,022 losses, four division titles (1995, 1997, 2001 and 2025), two wild-card berths (2000 and 2022) and no league championship. They have played 11 postseason series, winning 5 and losing 6, and four of the losses came in the American League Championship Series, one step from the World Series, in 1995, 2000, 2001 and 2025.
That makes Seattle's October history unusual. It is a short list, and almost every item on it is a story about how close the club came. This article ranks the best regular seasons by record, then walks through the postseason series in order. It also covers the long gap between 2001 and 2022, when a franchise that had won 116 games went two decades without a playoff berth. Every number comes from the historical record, and the context sticks to well-documented history.
One note on scope. The records here run through the 2025 season. For anything that changes, such as the current roster or standings, check the Seattle Mariners team page rather than this article.
The best regular seasons
The Mariners' best seasons by winning percentage, among those with 100 or more games, are below. The pattern is plain: one season far above the rest, and then a cluster of 90-win years.
| Season | Record | Finish | Result |
|---|---|---|---|
| 2001 | 116-46 | 1st | Division title, lost the ALCS |
| 2002 | 93-69 | 3rd | No postseason |
| 2003 | 93-69 | 2nd | No postseason |
| 2000 | 91-71 | 2nd | Wild card, lost the ALCS |
| 1997 | 90-72 | 1st | Division title, lost the ALDS |
| 2021 | 90-72 | 2nd | No postseason |
The 2001 team is the best in franchise history by 23 wins over the next-best season. Its 116 victories tie the 1906 Chicago Cubs for the most in a season in the modern era, and no other Mariners team has won more than 93. Yet the club did not reach the World Series, which is the sad paradox of the season, and more on that below.
The 2002 and 2003 teams are the part of the table that gets overlooked. Both won 93 games and missed the playoffs, finishing third in the first year and second in the second. No Seattle team won 90 games again until 2021, a stretch in which the club also dropped as low as 61-101, in 2008 and 2010.
The worst seasons by winning percentage are 1978 (56-104), 1980 (59-103), 1983 (60-102) and the 61-101 teams of 2008 and 2010. The expansion-era Mariners did not post a winning record until 1991, when they went 83-79, in their 15th season. Seattle's history is a story of long stretches of difficult baseball interrupted by a brilliant run, which is why the good seasons deserve to be read one at a time.
1977 to 1994: the expansion years
The Mariners joined the American League in 1977 and played in the Kingdome through the 1998 season. The club's first managers, Darrell Johnson (226-362 from 1977 to 1980) and Rene Lachemann (140-180 from 1981 to 1983), had losing records, and the early seasons read as a list of finishes near the bottom of the West. The best of the first eight was fourth place, in 1982, at 76-86.
Some of the foundations were laid in those years. Alvin Davis was the 1984 Rookie of the Year and hit 160 home runs for the club. Julio Cruz stole 290 bases between 1977 and 1983, still second in club history behind Ichiro Suzuki's 438, and Mark Langston, who pitched for Seattle from 1984 to 1989, struck out 1,078 batters. The talent that would change the club arrived in a cluster: Edgar Martinez debuted with the club in 1987, and Jay Buhner (1988), Ken Griffey and Randy Johnson (both 1989) joined it in the following seasons.
Lou Piniella took over in 1993 and managed the club until 2002, compiling a record of 836-711 in 1,547 games, the most games and wins of any Mariners manager. The 1993 team went 82-80, the franchise's second winning season, and the 1994 players' strike ended the next one with Seattle at 49-63.
1995: the division title that changed the club
The 1995 season is the pivot of Seattle history. The Mariners finished 79-66 in a season shortened by the aftermath of the strike, and they won the American League West in a one-game playoff against California after the Angels had pulled even. Randy Johnson won the Cy Young Award that year with an 18-2 record, a 2.48 earned run average and 294 strikeouts in 214 innings. Edgar Martinez, the club's designated hitter, won the American League batting title at .356 and drove in 113 runs. Griffey played only 72 games, because of a broken wrist.
Then came the first postseason series in franchise history, the division series against the Yankees. Seattle won it 3-2, taking the decisive fifth game in extra innings, a game remembered in the Northwest for Martinez's double and for Griffey scoring from first base. It is the series fans point to when asked about the club's best moment, and it is widely credited with helping persuade Washington state to fund a new ballpark, which eventually replaced the Kingdome. The Angels' side of that finish is in the history of the Los Angeles Angels.
The Mariners then lost the ALCS to Cleveland, 2-4. The Indians, as they were called then, had the best record in the American League, and Seattle had just played five draining games to get there. The loss ended the run, but the franchise now had a postseason win to its name and a case for staying in Seattle.
1997 and 2000: second and third trips
The 1997 team went 90-72 and won the division, with Griffey winning the Most Valuable Player award after a season with 56 home runs and 147 runs batted in. It lost the division series to Baltimore, 1-3. Griffey hit 56 home runs in both 1997 and 1998, and the club's 1997 team reached the playoffs for only the second time.
In 2000 the club went 91-71, finished half a game behind Oakland (91-70) in the West, and qualified as the wild card. Kazuhiro Sasaki was the Rookie of the Year, and the closer saved 129 games for the club from 2000 to 2003, the franchise's best total. Seattle swept the Chicago White Sox in the division series, 3-0, and then lost the ALCS to the Yankees, 2-4. Alex Rodriguez left after that season; his seven years with the Mariners (1994 to 2000) produced 189 home runs and a .309 average. The Athletics who finished ahead of Seattle that year are covered in the history of the Athletics.
2001: 116 wins and a quiet October
The 2001 Mariners won 116 games and lost 46, the best record in the majors, finishing 14 games ahead of Oakland (102-60) in the American League West. Ichiro Suzuki, a rookie who arrived from Japan's professional league, won both the Rookie of the Year and the Most Valuable Player awards. He batted .350 with 242 hits and 56 stolen bases, and each of those was the best mark in the majors that season.
The lineup around him was deep. Bret Boone hit .331 with 37 home runs and 141 runs batted in. Edgar Martinez hit .306 and drove in 116, John Olerud hit .302, and Mike Cameron hit 25 home runs and drove in 110. The team scored 927 runs and allowed 627, a differential of 300, which is the number that explains the 116 wins. On the mound, Freddy Garcia led the American League with a 3.05 earned run average, and Jamie Moyer went 20-6. Sasaki saved the games Seattle led late.
In the postseason Seattle beat Cleveland in the division series, 3-2, and then faced the Yankees in the ALCS and lost, 1-4. The Yankees went on to lose the World Series in seven games to the Arizona Diamondbacks. Seattle's season ended with the best record the American League has ever had and nothing to show for it beyond a division title.
That is the most frequently quoted fact about the 2001 team, and it deserves some perspective. A five-game or seven-game series is a small sample, and the 162 games of the regular season are a much better measure of a team's quality. A team can be much better than an opponent over a season and still lose a short series, because a handful of games leaves a lot of room for luck. The 2001 Mariners were probably the best team in baseball and lost anyway, which is the kind of outcome the short-series arithmetic allows, and which the fan base has never forgotten.
The lost two decades: 2002 to 2021
The 2002 and 2003 teams won 93 games each and missed the playoffs. In 2004 the club went 63-99, the start of a long slide. Over the next 18 seasons Seattle had winning records only a handful of times: 88-74 in 2007 (second place), 85-77 in 2009, 87-75 in 2014, 86-76 in 2016, 89-73 in 2018 and 90-72 in 2021, when it finished second in the West and missed the postseason. The seasons in between were mostly poor: 61-101 in 2008 and 2010, 67-95 in 2011 and 68-94 in 2019.
The club had great individual players in these years. Felix Hernandez won 169 games for the club between 2005 and 2019, the franchise record, and won the Cy Young Award in 2010 despite a 13-12 record; he had a 2.27 earned run average and 232 strikeouts in nearly 250 innings. That season is a standard example of why a pitcher's win-loss record is a poor measure of quality. Ichiro collected 2,542 hits for the club, the franchise record, and was elected to the Hall of Fame in 2025 with 393 of 394 votes. Kyle Seager hit 242 home runs between 2011 and 2021. Hernandez and Seager never played in a postseason game for Seattle.
The managers of the stretch tell the same story. Scott Servais led the club from 2016 to 2024 with a 680-642 record, and his tenure includes the end of the drought. Before him came Mike Hargrove (191-210), Eric Wedge (200-258) and Lloyd McClendon (162-159), none of whom reached October. The gap between 2001 and 2022 was long enough that a fan born in 2001 was old enough to vote before the next Mariners playoff game.
2022: the drought ends
The 2022 Mariners went 90-72, finished second in the West behind a 106-win Houston team, and claimed a wild-card berth, the first postseason appearance since 2001. Julio Rodriguez was the Rookie of the Year. The club beat Toronto 2-0 in the wild-card round and then met the Astros in the division series, where it lost three straight games, 0-3. The Astros' own history is told in the history of the Houston Astros.
For a team that had waited 21 years between appearances, the result mattered less than the fact of being there. The Mariners followed with 88-74 in 2023 (third in the West) and 85-77 in 2024 (second), good seasons that ended without October baseball, and they entered 2025 as a club with one series win since 2001.
2025: a division title and a seventh game
The 2025 team went 90-72 and won the American League West by three games over Houston (87-75), the first division title since 2001. Catcher Cal Raleigh hit 60 home runs, the most in the majors that year and the most ever by a Mariner, and drove in 125 runs. Julio Rodriguez added 32 homers and 95 runs batted in. The club beat Detroit in the division series 3-2, winning the decisive fifth game, and reached the American League Championship Series for the first time since 2001.
The ALCS against Toronto went the distance, and Seattle lost it, 3-4. The Blue Jays went on to the World Series, where they lost to the Los Angeles Dodgers in seven games. Seattle remains the only one of the 30 clubs that has never won a pennant. For how the pennant and the title fit together historically, see the history of the World Series.
What the October record says
Across 11 series, Seattle has won 5 and lost 6. Broken down by round:
- Wild-card round: 1 win and no losses, in 2022.
- Division series: 4 wins and 2 losses. Wins in 1995, 2000, 2001 and 2025; losses in 1997 and 2022.
- League championship series: no wins and 4 losses, in 1995, 2000, 2001 and 2025.
The ALCS record is the story of the franchise. In four tries the Mariners won 8 games and lost 16 against Cleveland, the Yankees twice and Toronto. The best chance came in 2025, when one more win in the seventh game would have sent Seattle to the first World Series in club history. The two earlier Yankees series were more lopsided, 2-4 in 2000 and 1-4 in 2001, and the 2001 team's loss is the one fans still argue about.
Common questions
Have the Mariners ever been to the World Series? No. Through the 2025 season they have no American League pennant. Their best finish is the seven-game loss to Toronto in the 2025 ALCS.
What is the Mariners' best season? 2001, at 116-46, the best record in the majors that year and the most wins in franchise history.
Who is the franchise's best hitter? It depends on the measure. Ichiro Suzuki leads in hits (2,542) and stolen bases (438); Ken Griffey leads in home runs (417); Edgar Martinez leads in runs batted in (1,261), runs (1,219) and walks (1,283). The best Mariners by position covers the argument.
Where do the Mariners play? T-Mobile Park, which opened in 1999 as Safeco Field and took its present name in 2019. The park guide is at T-Mobile Park: the history, the dimensions and how the park plays.
Where to go next
The live record and next game are on the Seattle Mariners team page, and the ballpark is at T-Mobile Park. For the full story of the club, start with the franchise history, and for news try the Seattle Mariners topic page.