NBA : Biggest year to year improvements from one season to the
next (based on regular season win percentage):
Change in
Franchise win %
1 Boston Celtics 2007 -> 2008 0.512 (0.293 -> 0.805)
2 San Antonio Spurs 1997 -> 1998 0.439 (0.244 -> 0.683)
3 San Antonio Spurs 1989 -> 1990 0.427 (0.256 -> 0.683)
4 Phoenix Suns 2004 -> 2005 0.402 (0.354 -> 0.756)
5 Boston Celtics 1979 -> 1980 0.390 (0.354 -> 0.744)
6 Detroit Pistons 2024 -> 2025 0.366 (0.171 -> 0.537)
7 Milwaukee Bucks 1969 -> 1970 0.354 (0.329 -> 0.683)
8 Miami Heat 2008 -> 2009 0.341 (0.183 -> 0.524)
9 Oklahoma City Thunder 2009 -> 2010 0.330 (0.280 -> 0.610)
9 Phoenix Suns 1988 -> 1989 0.330 (0.341 -> 0.671)
11 Brooklyn Nets 2001 -> 2002 0.317 (0.317 -> 0.634)
11 Denver Nuggets 2003 -> 2004 0.317 (0.207 -> 0.524)
11 Milwaukee Bucks 2014 -> 2015 0.317 (0.183 -> 0.500)
14 Golden State Warriors 2020 -> 2021 0.311 (0.231 -> 0.542)
15 Chicago Bulls 1995 -> 1996 0.305 (0.573 -> 0.878)
16 Chicago Bulls 2004 -> 2005 0.293 (0.280 -> 0.573)
16 Cleveland Cavaliers 1991 -> 1992 0.293 (0.402 -> 0.695)
16 Philadelphia 76ers 2017 -> 2018 0.293 (0.341 -> 0.634)
19 Los Angeles Lakers 2019 -> 2020 0.281 (0.451 -> 0.732)
19 Phoenix Suns 1969 -> 1970 0.281 (0.195 -> 0.476)
21 Dallas Mavericks 1994 -> 1995 0.280 (0.159 -> 0.439)
21 Golden State Warriors 1988 -> 1989 0.280 (0.244 -> 0.524)
21 Phoenix Suns 2013 -> 2014 0.280 (0.305 -> 0.585)
24 Atlanta Hawks 2020 -> 2021 0.270 (0.299 -> 0.569)
25 Atlanta Hawks 2014 -> 2015 0.269 (0.463 -> 0.732)
25 Memphis Grizzlies 2003 -> 2004 0.269 (0.341 -> 0.610)
Last season:
Detroit Pistons 2024 -> 2025 0.366 (0.171 -> 0.537)
Memphis Grizzlies 2024 -> 2025 0.256 (0.329 -> 0.585)
Cleveland Cavaliers 2024 -> 2025 0.195 (0.585 -> 0.780)
Portland Trail Blazers 2024 -> 2025 0.183 (0.256 -> 0.439)
San Antonio Spurs 2024 -> 2025 0.147 (0.268 -> 0.415)
Houston Rockets 2024 -> 2025 0.134 (0.500 -> 0.634)
Oklahoma City Thunder 2024 -> 2025 0.134 (0.695 -> 0.829)
Toronto Raptors 2024 -> 2025 0.061 (0.305 -> 0.366)
Atlanta Hawks 2024 -> 2025 0.049 (0.439 -> 0.488)
Indiana Pacers 2024 -> 2025 0.037 (0.573 -> 0.610)
Los Angeles Lakers 2024 -> 2025 0.037 (0.573 -> 0.610)
Washington Wizards 2024 -> 2025 0.037 (0.183 -> 0.220)
Golden State Warriors 2024 -> 2025 0.024 (0.561 -> 0.585)
New York Knickerbockers 2024 -> 2025 0.012 (0.610 -> 0.622)
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