Re: Williams sisters and Fed Cup
It is a shame the USA haven't won the Fed Cup since 2000. They have had 4 of the best players of this decade (Lindsay, Jennifer, Serena, Venus + Monica until 2003) and yet have only made one final since 2000 (and that final didn't feature any of the above players).
They have had the above 5 singles players, all who have dominated the game since 2000. They have also had 2 exceptional doubles teams in Lindsay/Lisa and S/V.
But I think in recent years, the best team has won (Russia). It's just they haven't been pushed enough by other countries.