Boston Red Sox records

1901–2026

Worst losses

Largest margins of defeat

  1. 3–27 Cleveland Guardians 1923
  2. 5–28 Toronto Blue Jays 2022
  3. 1–22 New York Yankees 2000
  4. 4–24 New York Yankees 1923
  5. 2–21 Minnesota Twins 1994

Best seasons

Highest regular-season win percentage

  1. 1912 105–47–2
  2. 1946 104–50–2
  3. 2018 108–54
  4. 1915 101–50–4
  5. 1903 91–47–3

Worst seasons

Lowest regular-season win percentage

  1. 1932 43–111
  2. 1926 46–107–1
  3. 1925 47–105
  4. 1906 49–105–1
  5. 1927 51–103

Best starts

Wins to open a season

  1. 6 to start 1918
  2. 5 to start 1920
  3. 5 to start 1941
  4. 5 to start 1946
  5. 5 to start 1999

Worst starts

Losses to open a season

  1. 8 to start 1945
  2. 6 to start 1905
  3. 6 to start 1927
  4. 6 to start 2011
  5. 5 to start 1966

Win streaks

Consecutive wins

  1. 15 1946
  2. 15 2026
  3. 13 1948
  4. 12 1939
  5. 12 1988

Losing streaks

Consecutive losses

  1. 20 1906
  2. 17 1926
  3. 15 1927
  4. 14 1930
  5. 13 1907

Biggest wins

Largest margins of victory

  1. 29–4 Baltimore Orioles 1950
  2. 24–4 Minnesota Twins 1940
  3. 23–3 Detroit Tigers 1953
  4. 24–5 Cleveland Guardians 1986
  5. 21–2 Baltimore Orioles 1949

Postseason

Seasons that reached the playoffs

  1. 2026 0–2
  2. 2025 1–2
  3. 2021 6–5
  4. 2018 11–3 title game
  5. 2017 1–3
  6. 2016 0–3
  7. 2013 11–5 title game
  8. 2009 0–3

World Series appearances

Seasons that reached the World Series

  1. 2018 won World Series
  2. 2013 won World Series
  3. 2007 won World Series
  4. 2004 won World Series
  5. 1986 lost World Series
  6. 1975 lost World Series
  7. 1967 lost World Series
  8. 1946 lost World Series
  9. 1918 won World Series
  10. 1916 won World Series
  11. 1915 won World Series
  12. 1912 won World Series
  13. 1903 won World Series

Ties

Games that ended level

  1. 1–1 Chicago White Sox 1985
  2. 4–4 Los Angeles Angels 1961
  3. 3–3 New York Yankees 1958
  4. 8–8 Cleveland Guardians 1956
  5. 7–7 Cleveland Guardians 1954
  6. 5–5 Cleveland Guardians 1954
  7. 14–14 Detroit Tigers 1949
  8. 1–1 Chicago White Sox 1947
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