Stadium: Duygu Aksit Oal Round: 64
| Fergana, Uzbekistan | 2018/06/19 05:00 | Guez, David v Lopez Perez | 0-6,6-2,2-6 |
| ATP Stuttgart Qual | 2018/06/09 11:00 | Youzhny, Mikhail v Guez, David | 6-2,6-3 |
| Challenger Loughborough | 2018/05/24 09:30 | Lucas Miedler v Guez, David | 6-4,6-2 |
| Challenger Loughborough | 2018/05/22 12:30 | Nielsen, Frederik v Guez, David | 2-6,4-6 |
| Tunisia F18, Singles Qualifying | 2018/05/13 09:00 | Guez, David v Artunedo Martinav. | 6-1,6-1 |
| Tunisia F18, Singles Qualifying | 2018/05/12 09:00 | Guez, David v Moez Echargui | 6-1,7-5 |
| Tunisia F18, Singles Qualifying | 2018/05/11 11:00 | Guez, David v Hidalgo, Diego | 6-4,6-2 |
| Tunisia F18, Singles Qualifying | 2018/05/10 09:00 | Guez, David v Mladenov, Vasko | 6-1,6-4 |
| Fergana, Uzbekistan | 2018/06/19 05:00 | Egor Gerasimov v Grigelis, Laurynas | 6-2,6-3 |
| Challenger Almaty Qual | 2018/06/10 04:30 | Grigelis, Laurynas v Daniel Masur | 6-3,3-6,5-7 |
| Challenger Almaty Qual | 2018/06/09 05:50 | Grigelis, Laurynas v Ivan Gakhov | 1-6,7-5,6-2 |
| Shymkent 2, Kazakhstan | 2018/06/06 05:00 | Jurij Rodionov v Grigelis, Laurynas | 6-4,3-6,7-6 |
| Shymkent 2, Kazakhstan | 2018/06/05 06:10 | Grigelis, Laurynas v Lopez Perez | 6-3,7-5 |
| Challenger Mestre | 2018/05/25 09:30 | Grigelis, Laurynas v Gian Marco Moroni | 2-6,0-6 |
| Challenger Mestre | 2018/05/24 10:55 | Grigelis, Laurynas v Vanni, Luca | 6-2,2-6,6-2 |
| Challenger Mestre | 2018/05/23 08:30 | Yang, Tsung-Hua v Grigelis, Laurynas | 3-6,0-6 |