NHL : Biggest declines
                                          Change in
    All Time:                               win %
  1 New York Rangers       1942 -> 1943    -0.325   (0.625 -> 0.300)
  2 Toronto Maple Leafs    1918 -> 1919    -0.313   (0.591 -> 0.278)
  3 Montreal Canadiens     1925 -> 1926    -0.281   (0.600 -> 0.319)
  4 Philadelphia Flyers    2006 -> 2007    -0.275   (0.616 -> 0.341)
  5 Chicago Blackhawks     1927 -> 1928    -0.273   (0.466 -> 0.193)
  6 Detroit Red Wings      1970 -> 1971    -0.272   (0.625 -> 0.353)
  6 Chicago Blackhawks     1953 -> 1954    -0.272   (0.493 -> 0.221)
  8 Boston Bruins          1931 -> 1932    -0.267   (0.705 -> 0.438)
  9 Toronto Maple Leafs    1925 -> 1926    -0.258   (0.633 -> 0.375)
 10 Detroit Red Wings      1937 -> 1938    -0.250   (0.615 -> 0.365)
 11 Detroit Red Wings      1996 -> 1997    -0.226   (0.799 -> 0.573)
 12 Montreal Canadiens     1947 -> 1948    -0.225   (0.650 -> 0.425)
 12 Los Angeles Kings      1981 -> 1982    -0.225   (0.619 -> 0.394)
 12 Chicago Blackhawks     1983 -> 1984    -0.225   (0.650 -> 0.425)
 15 St. Louis Blues        1981 -> 1982    -0.219   (0.669 -> 0.450)
 16 Winnipeg Jets          2025 -> 2026    -0.207   (0.707 -> 0.500)
 16 St. Louis Blues        2004 -> 2006    -0.207   (0.555 -> 0.348)
 16 Nashville Predators    2012 -> 2013    -0.207   (0.634 -> 0.427)
 16 Colorado Avalanche     2016 -> 2017    -0.207   (0.500 -> 0.293)
 20 Montreal Canadiens     2017 -> 2018    -0.206   (0.628 -> 0.422)
 21 Montreal Canadiens     2021 -> 2022    -0.202   (0.537 -> 0.335)
 21 Chicago Blackhawks     2017 -> 2018    -0.202   (0.665 -> 0.463)
 21 Boston Bruins          2024 -> 2025    -0.202   (0.665 -> 0.463)
 24 Washington Capitals    2003 -> 2004    -0.201   (0.561 -> 0.360)
 25 Florida Panthers       2012 -> 2013    -0.198   (0.573 -> 0.375)

    Last season:
  1 Winnipeg Jets          2025 -> 2026    -0.207   (0.707 -> 0.500)
  2 Vancouver Canucks      2025 -> 2026    -0.195   (0.549 -> 0.354)
  3 Toronto Maple Leafs    2025 -> 2026    -0.183   (0.659 -> 0.476)
  4 Calgary Flames         2025 -> 2026    -0.115   (0.585 -> 0.470)
  5 Washington Capitals    2025 -> 2026    -0.098   (0.677 -> 0.579)
  6 Vegas Golden Knights   2025 -> 2026    -0.092   (0.671 -> 0.579)
  7 Los Angeles Kings      2025 -> 2026    -0.091   (0.640 -> 0.549)
  8 Florida Panthers       2025 -> 2026    -0.086   (0.598 -> 0.512)
  9 St. Louis Blues        2025 -> 2026    -0.061   (0.585 -> 0.524)
 10 Edmonton Oilers        2025 -> 2026    -0.049   (0.616 -> 0.567)
 11 New York Rangers       2025 -> 2026    -0.048   (0.518 -> 0.470)
 12 New Jersey Devils      2025 -> 2026    -0.025   (0.555 -> 0.530)