Looking for a job quality meds delivery The potential womenâs quarterfinals at the U.S. Open are No. 1 Serena Williams against No. 8 Angelique Kerber, No. 2 Victoria Azarenka against No. 7 Petra Kvitova, No. 3 Agnieszka Radwanska against No. 5 Li Na, and No. 4 Sara Errani against No. 6 Caroline Wozniacki.