Stadium: Court Central Round: 27
| ITF France F15 | 2017/07/12 16:20 | Doumbia, Sadio v Mitjana, Leny | 6-2,6-0 |
| ITF Cameroon F2 | 2018/12/05 08:30 | Doumbia, Sadio v Anand, Kunal | 6-3,6-4 |
| ITF Cameroon F2 | 2018/12/04 08:30 | Doumbia, Sadio v Forchap, David Chaplefeh | 6-4,6-0 |
| ITF Cameroon F1 | 2018/11/29 09:50 | Doumbia, Sadio v Sao Thiago, Igor | 3-6,5-7 |
| 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 Cameroon F2 | 2018/12/05 12:05 | Yitbarek, Simon v Mitjana, Leny | 3-6,4-6 |
| ITF Cameroon F2 | 2018/12/04 08:30 | Bationo, Abdoulaziz v Mitjana, Leny | 1-6,5-7 |
| ITF Cameroon F1 | 2018/11/30 10:10 | Mitjana, Leny v Corentin Denolly | 7-6,7-6 |
| ITF Cameroon F1 | 2018/11/29 08:30 | Mitjana, Leny v Bojanovic, Darko | 6-4,6-2 |
| ITF Cameroon F1 | 2018/11/28 11:00 | Mitjana, Leny v Bartley, Lamar | 6-4,6-3 |
| Brest, France, Qualifying | 2018/10/20 15:25 | Mitjana, Leny v Ivan Gakhov | 4-6,4-6 |
| ITF France F22 | 2018/10/18 08:00 | Mitjana, Leny v Yanais Laurent | 1-6,3-6 |
| ITF France F22 | 2018/10/16 10:00 | Mitjana, Leny v Jaimee Floyd Angele | 6-2,6-3 |