Stadium: Court Central Round: 26
| ITF Cameroon F1 | 2018/11/28 09:40 | Doumbia, Sadio v Bushamuka, William | 6-1,6-2 |
| Challenger Canberra 2 | 2018/10/31 00:35 | Doumbia, Sadio v Grills, Jacob | 6-7,6-3,3-6 |
| Challenger Canberra 2 | 2018/10/29 01:55 | Thomas Fancutt v Doumbia, Sadio | 6-4,4-6,2-6 |
| Challenger Traralgon | 2018/10/25 01:50 | Doumbia, Sadio v Yoshihito Nishioka | 1-6,4-6 |
| Challenger Traralgon | 2018/10/23 03:05 | Doumbia, Sadio v Yosuke Watanuki | 3-6,6-3,6-3 |
| ITF Lebanon F2 | 2018/10/05 13:00 | Jaroslav Pospisil v Doumbia, Sadio | 6-2,1-6,7-5 |
| ITF Lebanon F2 | 2018/10/04 13:00 | Samaha, Giovani v Doumbia, Sadio | 0-6,3-6 |
| ITF Lebanon F2 | 2018/10/03 13:00 | Bertuccioli, Federico v Doumbia, Sadio | 2-6,1-6 |
| ITF Cameroon F1 | 2018/11/27 08:30 | Seeberger, Matt v Sao Thiago, Igor | 3-6,2-6 |
| ITF Cameroon F1 | 2018/11/26 11:30 | Sao Thiago, Igor v Yitbarek, Simon | 4-6,6-7 |
| ITF Tunisia F41 | 2018/11/19 08:30 | Louis Tessa v Sao Thiago, Igor | 6-4,6-1 |
| ITF Tunisia F41 | 2018/11/18 10:00 | Ramirez Utermann, Carlos v Sao Thiago, Igor | 1-6,0-6 |
| ITF Tunisia F41 | 2018/11/17 09:00 | Del Federico, Andrea v Sao Thiago, Igor | 1-6,3-6 |
| Tunisia F40, Singles | 2018/11/11 08:00 | Sao Thiago, Igor v Feler, Melik | 6-7,4-6 |
| Tunisia F40, Singles | 2018/11/10 10:00 | Sao Thiago, Igor v Vito Dell'Elba | 2-6,6-3,6-3 |
| ITF Portugal F21 | 2018/10/14 12:00 | Sao Thiago, Igor v Salgado, Afonso | 4-6,4-6 |