| Di Giuseppe - Aiava 7:6(3) 6:4 | 6 s |
| Y.Chung - Tat.Ito 2:6 3:6 | 6 s |
| S.Williams - Kar.Plíšková 4:6 6:4 5:7 | 6 s |
| De.Novak - Rola 2:6 3:6 | 6 s |
| Danilovic - Qostal 6:1 6:2 | 5 s |
| Struff - Khachanov 3:6 6:3 4:6 | 5 s |
| Linette - Kvitová 3:6 2:6 | 5 s |
| Matsui - Myneni 3:6 ret. | 6 s |
| Fritz - Kubler 6:3 3:6 6:3 ret. | 5 s |
| Londero - R.Quiroz 6:7(5) 7:6(7) 6:1 | 5 s |
| Bondar - L.I.paar 6:2 6:2 | 6 s |
| D.Jakupovic - Brady 0:6 3:6 | 5 s |
| Di Giuseppe - V.Kudermetova 2:6 5:4 ret. | 6 s |
| Al.Bedene - Raonic 0:6 3:6 | 6 s |
| Gavrilova - M.Sharapova 0:6 4:6 | 6 s |
| Auger Aliassime - S.Stakhovsky 2:6 0:3 ret. | 6 s |
| N.Osaka - S.W.hsieh 6:4 6:7(4) 3:6 | 6 s |
| Anisimova - Potapova 6:2 7:5 | 5 s |
| S.Sharipova - S.Zhang 3:6 6:7(3) | 5 s |
| Halys - Grigelis 6:3 7:6(3) | 7 s |
| G.Monfils - Isner 6:4 6:4 | 5 s |
| Giustino - Troicki 6:4 2:6 4:6 | 4 s |
| Ojeda Lara - Basso 6:7(1) 3:6 | 6 s |