Seattle Mariners records

Best seasons

Highest regular-season win percentage

1. 2001 116–46
2. 2002 93–69
3. 2003 93–69
4. 2000 91–71
5. 1997 90–72

Worst seasons

Lowest regular-season win percentage

1. 1978 56–104
2. 1980 59–103–1
3. 1983 60–102
4. 2008 61–101
5. 2010 61–101

Best starts

Wins to open a season

1. 6 to start 1985
2. 3 to start 1995
3. 3 to start 2014
4. 3 to start 2019
5. 2 to start 1979

Worst starts

Losses to open a season

1. 6 to start 1991
2. 5 to start 1994
3. 5 to start 2004
4. 4 to start 1989
5. 4 to start 1992

Win streaks

Consecutive wins

1. 15 2001
2. 14 2022
3. 10 1996
4. 10 2002
5. 10 2025

Losing streaks

Consecutive losses

1. 17 2011
2. 14 1992
3. 12 1980
4. 12 1989
5. 12 2008

Biggest wins

Largest margins of victory

1. 19–1 Sacramento Athletics 2026
2. 19–2 Texas Rangers 1994
3. 22–6 Detroit Tigers 1999
4. 18–2 Atlanta Braves 2025
5. 16–1 New York Yankees 1979

Postseason

Seasons that reached the playoffs

1. 2025 6–6
2. 2022 2–3
3. 2001 4–6
4. 2000 5–4
5. 1997 1–3
6. 1995 6–6

World Series appearances

Seasons that reached the World Series

None on record.

Ties

Games that ended level

1. 7–7 Minnesota Twins 1981
2. 3–3 Detroit Tigers 1980