Venus withdraws with left knee injury suffered in Beijing
Serena's caused withdrawal from Philadelphia.


Philadelphia, Withdrawals
#1 s1 Lindsay Davenport USA flu
#3 s2 Maria Sharapova RUS r thumb sprain
#7 Venus Williams USA left knee
#9 s5 Patty Schnyder SUI left hand contusion
#11 Serena Williams USA left knee & ankle
#22 Anna-Lena Groenfeld GER
#23 Alicia Molik AUS vestibular neuronitis
#47 Shahar Peer ISR
#50 Akiko Morigami JPN
#64 Maria Vento-Kabchi VEN