Stadium: Pista 3 Round: 25 Ground: Clay
| Challenger Cassis | 2018/09/03 09:00 | Guez, David v Antoine Escoffier | 7-5,2-6,3-6 |
| Segovia, Spain | 2018/07/31 11:35 | Gian Marco Moroni v Guez, David | 6-3,6-2 |
| Challenger Astana | 2018/07/16 08:50 | Guez, David v Egor Gerasimov | 6-7,3-6 |
| Challenger Recanati | 2018/07/04 19:15 | Galovic, Viktor v Guez, David | 6-3,6-4 |
| Challenger Recanati | 2018/07/02 14:15 | Roberto Cid Subervi v Guez, David | 6-4,6-7,2-6 |
| ATP Antalya Qual | 2018/06/23 12:20 | Guez, David v Grigelis, Laurynas | 2-6,6-3,5-7 |
| 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 Sibiu | 2018/09/18 12:10 | Viola, Matteo v Nino Serdarusic | 2-6,7-6,1-6 |
| Istanbul, Turkey | 2018/09/14 13:25 | Fabbiano, Thomas v Viola, Matteo | 3-6,6-2,6-4 |
| Istanbul, Turkey | 2018/09/13 08:00 | Viola, Matteo v Constant Lestienne | 6-3,6-1 |
| Istanbul, Turkey | 2018/09/10 09:30 | Denis Yevseyev v Viola, Matteo | 6-7,4-6 |
| Challenger Cassis | 2018/09/03 09:00 | Viola, Matteo v Wang, Tak Khunn | 6-0,5-7,5-7 |
| Challenger Como | 2018/08/25 10:45 | Zekic, Miljan v Viola, Matteo | 6-2,6-4 |
| Cordenons, Italy | 2018/08/14 10:00 | Viola, Matteo v Facundo Bagnis | 0-6,2-6 |
| Segovia, Spain | 2018/08/02 10:20 | Viola, Matteo v Quiroz, Roberto | 5-7,5-7 |