Stadium: Court 1 Round: 14 Ground: Clay
| ITF Hungary F7 | 2018/08/31 09:00 | Erler, Alexander v Doumbia, Sadio | 3-6,6-1,3-6 |
| Challenger - Aix en Provence | 2021/06/14 08:30 | Doumbia, Sadio v Oriol Roca Batalla | 1-6,4-6 |
| Challenger - Aix en Provence | 2021/06/13 08:30 | Nick Chappell v Doumbia, Sadio | 0-6,4-6 |
| Challenger - Split | 2021/04/04 12:50 | Doumbia, Sadio v Mirza Basic | 6-7,3-6 |
| Challenger Gran Canaria | 2021/03/01 11:00 | Filip Cristian Jianu v Doumbia, Sadio | 6-2,6-3 |
| Challenger Gran Canaria Qual | 2021/02/28 16:45 | Pol Martin Tiffon v Doumbia, Sadio | 6-7,6-4,6-7 |
| Challenger Gran Canaria | 2021/02/21 15:00 | Elmar Ejupovic v Doumbia, Sadio | 7-6,6-3 |
| Challenger - Cherbourg | 2021/02/07 11:00 | Doumbia, Sadio v Jonas Forejtek | 6-7,2-6 |
| ITF - M15 Manacor | 2021/01/15 10:45 | Evan Furness v Doumbia, Sadio | 6-0,6-2 |
| ITF M25 Klosters | 2021/06/24 07:00 | Erler, Alexander v Nicolas Moreno De Alboran | 1-6,5-7 |
| ITF M25 Klosters | 2021/06/23 07:00 | Erler, Alexander v Yannik Steinegger | 6-7,6-2,6-1 |
| Challenger - Prostejov | 2021/06/16 10:05 | Dalibor Svrcina v Erler, Alexander | 6-1,7-5 |
| Challenger - Prostejov | 2021/06/14 08:30 | Erler, Alexander v Nejedly, Pavel | 7-5,6-3 |
| Challenger - Prostejov | 2021/06/13 11:10 | Erler, Alexander v Jakub Mensik | 6-3,6-4 |
| ITF M25 Most | 2021/05/27 07:55 | Erler, Alexander v Franco Agamenone | 4-6,0-6 |
| ITF M25 Most | 2021/05/25 09:35 | Erler, Alexander v Thirouin, Jean | 7-5,7-6 |
| ITF - M15 Antalya | 2021/05/16 07:30 | Erler, Alexander v Nick Hardt | 0-6,6-7 |