| S.Giraldo - J.Ward 6:4 6:4 | 6 s |
| Donati - Travaglia 3:6 2:6 | 3 s |
| Majchrzak - Bolelli 5:7 6:7(5) | 3 s |
| Gorgodze - Flink 3:6 5:7 | 3 s |
| Chirico - Dodin 6:3 6:4 | 2 s |
| Herbert - Rodionov 6:1 6:2 | 2 s |
| Kostyuk - S.Zheng 6:3 6:1 | 2 s |
| Uchiyama - Napolitano 4:6 6:7(5) | 2 s |
| Kyrgios - R.Haase 6:3 6:4 7:5 | 3 s |
| Gaio - Gojowczyk 7:5 4:6 2:6 | 3 s |
| K.King - S.Stakhovsky 4:6 0:6 | 2 s |
| Fritz - Bautista 2:6 3:6 2:6 | 3 s |
| Marchenko - Basic 5:7 2:4 ret. | 4 s |
| J.S.nam - Ramanathan 3:6 6:7(6) | 3 s |
| Ritschard - J.Arconada 6:4 5:7 1:6 | 4 s |
| Sabalenka - Ek.Alexandrova 6:3 6:3 | 4 s |
| Haerteis - Napolitano 2:6 3:6 | 3 s |
| Uchida - T.L.wu 1:6 4:6 | 2 s |
| Delbonis - G.Barrere 7:6(6) 6:4 | 3 s |
| T.Brkic - D.Masur 1:6 2:6 | 3 s |
| Rosol - De.Novak 7:5 7:6(1) | 4 s |
| Bouzková - Muchová 4:6 3:6 | 3 s |
| Kolář - Majchrzak 2:6 2:6 | 2 s |
| Ma.Cilič - Querrey 7:6(3) 6:2 | 3 s |
| M.Berrettini - Khachanov 6:4 6:2 | 6 s |
| M.Polmans - Bachinger 3:6 6:4 6:8 | 3 s |
| Brengle - Kr.Plíšková 7:6(6) 6:0 | 4 s |