Prima zi de la US Open a adus si eliminarea mai multor capi de serie de pe tabloul feminin de simplu, Monica Puig (aur la Jocurile Olimpice de la Rio de Janeiro) fiind invinsa de Zheng Saisai, din China. Au mai parasit competitia prematur: Irina Camelia Begu (favorita 21), Sabine Lisicki, Sara Errani, CoCo Vandeweghe (28) si Barbora Strycova (18 - invinsa de Monica Niculescu).
Turul I feminin, rezultate consemnate luni
8-Madison Keys - Alison Riske 4-6 7-6(5) 6-2
12-Dominika Cibulkova - Magda Linette 6-2 6-3
Lesia Tsurenko - 21-Irina Begu 6-0 6-4
3-Garbine Muguruza Blanco - Elise Mertens 2-6 6-0 6-3
Wang Yafan - Alison Van Uytvanck 6-3 7-6(4)
Duan Yingying - Maria Sakkari 6-4 4-6 6-3
Anastasija Sevastova - Anna Karolina Schmiedlova 6-3 6-3
Yulia Putintseva - Sabine Lisicki 6-1 6-2
Naomi Osaka - 28-CoCo Vandeweghe 6-7(4) 6-3 6-4
Catherine Bellis - Viktorija Golubic 6-2 6-3
Shelby Rogers - 27-Sara Errani 6-4 7-6(3)
Christina McHale - Mona Barthel 6-2 6-2
9-Svetlana Kuznetsova - Francesca Schiavone 6-1 6-2
Mirjana Lucic-Baroni - Alize Cornet 6-4 6-1
Caroline Wozniacki - Taylor Townsend 4-6 6-3 6-4
Cagla Buyukakcay - Irina Falconi 6-2 6-1
2-Angelique Kerber - Polona Hercog 6-0 1-0 (abandon Hercog)
Andrea Petkovic - Kristina Kucova 7-6(3) 6-3
24-Belinda Bencic - Samantha Crawford 6-7(6) 6-3 6-4
14-Petra Kvitova - Jelena Ostapenko 7-5 6-3
Carina Witthoeft - 30-Misaki Doi 6-4 6-1
7-Roberta Vinci - Anna-Lena Friedsam 6-2 6-4
13-Johanna Konta - Bethanie Mattek-Sands 6-3 6-3
22-Elina Svitolina - Mandy Minella 6-7(5) 6-0 6-2
Monica Niculescu - 18-Barbora Strycova 6-3 6-7(3) 6-1
Lauren Davis - Aliaksandra Sasnovich 6-2 4-6 7-5
Kayla Day - Madison Brengle 6-2 4-2 (abandon Brengle)
Kateryna Bondarenko - Hsieh Su-Wei 6-0 7-5
Ana Bogdan - Sorana Cirstea 0-6 7-5 6-2
Zheng Saisai - 32-Monica Puig 6-4 6-2
Tsvetana Pironkova - Virginie Razzano 6-1 6-2
Evgeniya Rodina - Danielle Collins 6-1 6-2.
