Well let's begin with the 4 quarters and let's see what's worst. I come to think of the 3rd and 4th quarter as difficult but today it's not easy to decide as the level of the players are going up all the time. What are your comments?
S. Williams vs Qualifier
S. Peng vs K. Nara
K. Kanepi vs A. Riske
Y. Meusburger vs Suarez Navarro
F. Pennetta vs L. Safarova
M. Rybarikova vs A. Beck
A. Medina Garrigues vs V. Lepchenko
S. Cirstea vs P. Kvitova
S. Halep vs Qualifier
L. Arruabarrena vs T. Pironkova
S. Zhang vs I. Begu
Qualifier vs S. Lisicki
A. Ivanovic vs M. Keys
K. Knapp vs B. Jovanovski
M. Torro-Flor vs A. Pavlyuchenkova
E. Svitolina vs J. Jankovic
A. Kerber vs Qualifier
Qualifier vs M. Kirilenko
F. Schiavone vs E. Vesnina
A. Petkovic vs S. Errani
C. Wozniacki vs E. Makarova
D. Hantuchova vs R. Vinci
S. Kuznetsova vs A. Cornet
E. Bouchard vs A. Radwanska
M. Sharapova vs K. Koukalova
C. McHale vs L. Davis
G. Muguruza vs S. Soler-Espinosa
S. Stosur vs D. Cibulkova
S. Stephens vs Qualifier
Qualifier vs S. Voegele
J. Zheng vs Qualifier
K. Flipkens vs N. Li
S. Williams vs Qualifier
S. Peng vs K. Nara
K. Kanepi vs A. Riske
Y. Meusburger vs Suarez Navarro
F. Pennetta vs L. Safarova
M. Rybarikova vs A. Beck
A. Medina Garrigues vs V. Lepchenko
S. Cirstea vs P. Kvitova
S. Halep vs Qualifier
L. Arruabarrena vs T. Pironkova
S. Zhang vs I. Begu
Qualifier vs S. Lisicki
A. Ivanovic vs M. Keys
K. Knapp vs B. Jovanovski
M. Torro-Flor vs A. Pavlyuchenkova
E. Svitolina vs J. Jankovic
A. Kerber vs Qualifier
Qualifier vs M. Kirilenko
F. Schiavone vs E. Vesnina
A. Petkovic vs S. Errani
C. Wozniacki vs E. Makarova
D. Hantuchova vs R. Vinci
S. Kuznetsova vs A. Cornet
E. Bouchard vs A. Radwanska
M. Sharapova vs K. Koukalova
C. McHale vs L. Davis
G. Muguruza vs S. Soler-Espinosa
S. Stosur vs D. Cibulkova
S. Stephens vs Qualifier
Qualifier vs S. Voegele
J. Zheng vs Qualifier
K. Flipkens vs N. Li