NHL : Biggest improvements
                                          Change in
    All Time:                               win %
  1 San Jose Sharks        1993 -> 1994     0.346   (0.143 -> 0.489)
  2 Montreal Canadiens     1926 -> 1927     0.340   (0.319 -> 0.659)
  3 Montreal Canadiens     1943 -> 1944     0.330   (0.500 -> 0.830)
  4 Boston Bruins          1925 -> 1926     0.328   (0.200 -> 0.528)
  5 New Jersey Devils      2022 -> 2023     0.299   (0.384 -> 0.683)
  6 Colorado Avalanche     1992 -> 1993     0.294   (0.325 -> 0.619)
  7 Colorado Avalanche     2017 -> 2018     0.286   (0.293 -> 0.579)
  7 Pittsburgh Penguins    2006 -> 2007     0.286   (0.354 -> 0.640)
  9 Chicago Blackhawks     1929 -> 1930     0.284   (0.250 -> 0.534)
 10 Colorado Avalanche     2013 -> 2014     0.277   (0.406 -> 0.683)
 11 New York Islanders     2001 -> 2002     0.268   (0.317 -> 0.585)
 12 Boston Bruins          1967 -> 1968     0.254   (0.314 -> 0.568)
 13 Seattle Kraken         2022 -> 2023     0.244   (0.366 -> 0.610)
 14 Philadelphia Flyers    2007 -> 2008     0.238   (0.341 -> 0.579)
 15 Buffalo Sabres         1972 -> 1973     0.237   (0.327 -> 0.564)
 15 Detroit Red Wings      1986 -> 1987     0.237   (0.250 -> 0.487)
 17 Dallas Stars           1996 -> 1997     0.232   (0.402 -> 0.634)
 18 Detroit Red Wings      1977 -> 1978     0.231   (0.256 -> 0.487)
 18 Edmonton Oilers        1981 -> 1982     0.231   (0.463 -> 0.694)
 20 Boston Bruins          1929 -> 1930     0.227   (0.648 -> 0.875)
 21 Colorado Avalanche     1994 -> 1995     0.225   (0.452 -> 0.677)
 22 Toronto Maple Leafs    1919 -> 1920     0.222   (0.278 -> 0.500)
 23 Carolina Hurricanes    2004 -> 2006     0.220   (0.463 -> 0.683)
 23 Ottawa Senators        1996 -> 1997     0.220   (0.250 -> 0.470)
 25 Buffalo Sabres         1974 -> 1975     0.219   (0.487 -> 0.706)

    Last season:
  1 Columbus Blue Jackets  2024 -> 2025     0.141   (0.402 -> 0.543)
  2 Montreal Canadiens     2024 -> 2025     0.140   (0.415 -> 0.555)
  3 Anaheim Ducks          2024 -> 2025     0.128   (0.360 -> 0.488)
  4 Washington Capitals    2024 -> 2025     0.122   (0.555 -> 0.677)
  5 Ottawa Senators        2024 -> 2025     0.115   (0.476 -> 0.591)
  6 Calgary Flames         2024 -> 2025     0.091   (0.494 -> 0.585)
  7 Vegas Golden Knights   2024 -> 2025     0.073   (0.598 -> 0.671)
  8 Minnesota Wild         2024 -> 2025     0.061   (0.530 -> 0.591)
  8 New Jersey Devils      2024 -> 2025     0.061   (0.494 -> 0.555)
 10 Chicago Blackhawks     2024 -> 2025     0.055   (0.317 -> 0.372)
 11 Toronto Maple Leafs    2024 -> 2025     0.037   (0.622 -> 0.659)
 12 Los Angeles Kings      2024 -> 2025     0.036   (0.604 -> 0.640)
 12 Winnipeg Jets          2024 -> 2025     0.036   (0.671 -> 0.707)
 14 San Jose Sharks        2024 -> 2025     0.030   (0.287 -> 0.317)
 15 St. Louis Blues        2024 -> 2025     0.024   (0.561 -> 0.585)
 15 Tampa Bay Lightning    2024 -> 2025     0.024   (0.598 -> 0.622)