What powerful duo appeared a total of seven times in the eight US Open Singles Finals, 1997 to 2004?

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Venus Williams and Serena Williams have, between them, played 7 times. Two of them were against each other, and neithe rof them appeared in the 1998, 2003 or 2004 finals. 1997 Martina Hingis def. Venus Williams 6-0 6-4 1998 Lindsay Davenport def. Martina Hingis 6-3 7-5 1999 Serena Williams def. Martina Hingis 6-3 7-6 2000 Venus Williams def. Lindsay Davenport 6-4 7-5 2001 Venus Williams def. Serena Williams 6-2 6-4 2002 Serena Williams def. Venus Williams 6-4 6-3 2003 Justine Henin-Hardenne def. Kim Clijsters 7-5 6-1 2004 Svetlana Kuznetsova def. Elena Dementieva 6-3 7-5 Jun 28 05, 1:52 AM