Players who have faced both Williams sisters in the same tournament (x-Grand Slam):
x-Kim Clijsters, 2009 U.S. Open (def. Venus-4R; def. Serena-SF)
x-Justine Henin, 2007 U.S. Open (def. Serena-QF; def. Venus-SF)
Lindsay Davenport, 2004 Los Angeles (def. Venus, retired-SF; def. Serena-F)
Kim Clijsters, 2002 WTA Championships (def. Venus, retired-SF; def. Serena-F)
x-Martina Hingis, 2001 Australian Open (def. Serena-QF; def. Venus-SF)
Steffi Graf, 1999 Sydney (def. Serena-R16; def. Venus-QF)
Arantxa Sanchez Vicario, 1998 Sydney (def. Serena-SF; def. Venus-F)
x-Li Na, 2010 Australian Open (beat Venus-QF; lost to Serena-SF)
Elena Dementieva, 2009 WTA Championships (lost to Serena-RR; beat Venus-RR)
Svetlana Kuznetsova, 2008 Miami (def. Venus-QF; lost to Serena-SF)
Maria Sharapova, 2007 Miami (def. Venus-R32; lost to Serena-R16)
Chan Yung-jan, 2007 Charleston (def. Serena, retired-R32; lost to Venus-R16)
x-Jill Craybas, 2005 Wimbledon (def. Serena-R32; lost to Venus-R16)
Elena Dementieva, 2004 Miami (def. Venus-QF; lost to Serena-F)
Jennifer Capriati, 2001 Miami (def. Serena-QF; lost to Venus-F)
x-Lindsay Davenport, 2000 U.S. Open (def. Serena-QF; lost to Venus-F)
x-Martina Hingis, 1999 U.S. Open (def. Venus-SF; lost to Serena-F)
Martina Hingis, 1999 Rome (def. Serena-QF; lost to Venus-SF)
Martina Hingis, 1998 Miami (def. Serena-QF; lost to Venus-SF)
Joannette Kruger, 1998 Oklahoma City (def. Serena-QF; lost to Venus-F)
x-Virginia Ruano Pascual, 1998 Wimbledon (def. Serena, retired-R32; lost to Venus-R16)
Dinara Safina, 2008 WTA Championships (lost to Serena-RR; lost to Venus-RR)
Svetlana Kuznetsova, 2009 WTA Championships (lost to Serena-RR; lost to Venus-RR)
