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 Washington Mystics         1998 -> 1999     0.275   (0.100 -> 0.375)
  6 Chicago Sky                2006 -> 2007     0.265   (0.147 -> 0.412)
  6 Phoenix Mercury            2003 -> 2004     0.265   (0.235 -> 0.500)
  8 Houston Comets             1997 -> 1998     0.257   (0.643 -> 0.900)
  9 Los Angeles Sparks         1999 -> 2000     0.250   (0.625 -> 0.875)
 10 Connecticut Sun            2004 -> 2005     0.236   (0.529 -> 0.765)

    Last season:
    Chicago Sky                2006 -> 2007     0.265   (0.147 -> 0.412)
    San Antonio Silver Stars   2006 -> 2007     0.206   (0.382 -> 0.588)
    Cleveland Rockers          2002 -> 2003     0.188   (0.312 -> 0.500)
    Portland Fire              2001 -> 2002     0.156   (0.344 -> 0.500)
    Charlotte Sting            2005 -> 2006     0.148   (0.176 -> 0.324)
    New York Liberty           2006 -> 2007     0.147   (0.324 -> 0.471)
    Phoenix Mercury            2006 -> 2007     0.147   (0.529 -> 0.676)
    Detroit Shock              2006 -> 2007     0.030   (0.676 -> 0.706)