Stadium: Center Round: 54
| ITF France F13 | 2015/07/07 08:00 | Guez, David v Doumbia, Sadio | 2-6,3-6 |
| ITF France F6 | 2015/03/21 13:30 | Doumbia, Sadio v Guez, David | 3-6,1-6 |
| Challenger Lille Qual | 2018/03/18 10:00 | Guez, David v Cacic, Nikola | 6-1,6-7,6-3 |
| Challenger Lille Qual | 2018/03/17 10:45 | Guez, David v Gueydan, Quentin | 6-1,6-4 |
| France F4, Singles | 2018/03/10 15:50 | Botic Van De Zandschulp v Guez, David | 2-6,7-6,6-3 |
| France F4, Singles | 2018/03/09 14:25 | Rochette, Laurent v Guez, David | 3-6,3-6 |
| France F4, Singles | 2018/03/08 11:00 | Enzo Couacaud v Guez, David | 4-6,2-6 |
| France F4, Singles | 2018/03/07 11:00 | Petit, Gabriel v Guez, David | 5-7,1-6 |
| ITF Portugal F2 | 2018/03/05 22:15 | Evan Furness v Guez, David | 6-1,6-1 |
| ITF Portugal F2 | 2018/03/05 14:20 | Guez, David v Manuel Guinard | 5-7,6-4,6-4 |
| Challenger Lille Qual | 2018/03/18 10:00 | Geens, Clement v Doumbia, Sadio | 6-7,3-6 |
| Challenger Lille Qual | 2018/03/17 09:00 | Kanar, Jonathan v Doumbia, Sadio | 4-6,3-6 |
| France F4, Singles | 2018/03/07 15:20 | Igor Sijsling v Doumbia, Sadio | 6-2,7-5 |
| France F4, Singles | 2018/03/06 13:40 | Robert, Quentin v Doumbia, Sadio | 1-6,2-6 |
| ITF Italy F1 | 2018/02/27 10:00 | Boutillier, Remi v Doumbia, Sadio | 6-4,7-5 |
| Bergamo, Italy | 2018/02/21 14:00 | Doumbia, Sadio v Salvatore Caruso | 5-7,2-6 |
| Challenger Bergamo Qual | 2018/02/19 10:45 | Doumbia, Sadio v Basso, Andrea | 6-7,7-6,7-6 |
| Challenger Bergamo Qual | 2018/02/18 11:25 | Doumbia, Sadio v Jurij Rodionov | 6-2,2-6,6-2 |