Biggest improvements from one season to the
next (based on regular season win percentage):
                                             Change in
       Franchise                               win %

  1 Detroit Shock              2002 -> 2003     0.454   (0.281 -> 0.735)
  2 Sacramento Monarchs        1998 -> 1999     0.327   (0.267 -> 0.594)
  3 Charlotte Sting            2000 -> 2001     0.313   (0.250 -> 0.563)
  4 Cleveland Rockers          1999 -> 2000     0.312   (0.219 -> 0.531)
  5 Los Angeles Sparks         2007 -> 2008     0.294   (0.294 -> 0.588)
  6 Washington Mystics         1998 -> 1999     0.275   (0.100 -> 0.375)
  7 Chicago Sky                2006 -> 2007     0.265   (0.147 -> 0.412)
  7 Phoenix Mercury            2003 -> 2004     0.265   (0.235 -> 0.500)
  9 Houston Comets             1997 -> 1998     0.257   (0.643 -> 0.900)
 10 Los Angeles Sparks         1999 -> 2000     0.250   (0.625 -> 0.875)

    Last season:
    Los Angeles Sparks         2007 -> 2008     0.294   (0.294 -> 0.588)
    Cleveland Rockers          2002 -> 2003     0.188   (0.312 -> 0.500)
    Minnesota Lynx             2007 -> 2008     0.177   (0.294 -> 0.471)
    Portland Fire              2001 -> 2002     0.156   (0.344 -> 0.500)
    Charlotte Sting            2005 -> 2006     0.148   (0.176 -> 0.324)
    Seattle Storm              2007 -> 2008     0.147   (0.500 -> 0.647)
    Houston Comets             2007 -> 2008     0.118   (0.382 -> 0.500)
    San Antonio Silver Stars   2007 -> 2008     0.118   (0.588 -> 0.706)
    Connecticut Sun            2007 -> 2008     0.089   (0.529 -> 0.618)
    New York Liberty           2007 -> 2008     0.088   (0.471 -> 0.559)