New York: Second seed Agnieszka Radwanska of Poland crashed out of the US Open after she lost to Roberta Vinci of Italy here last night.
Radwanska was stunned 1-6, 4-6 in the fourth round match.
She would now meet her compatriot Sara Errani who pulled an upset victory over sixth seeded Angelique Kerber of Germany 7-6, 6-3.
Meanwhile, Serena Williams continued her domination and moved into the quarter finals of the tournament without dropping a set.
Williams Andrea Hlavackova 6-0, 6-0 in 57 minutes.
Williamswill next face former No 1 Ana Ivanovic, who beat Tsvetana Pironkova 6-0, 6-4.
By Indian Sports News Network