Stadium: Court Nissan Round: 14 Ground: Clay
| Orlando, USA | 2021/06/07 14:00 | Thiago Agustin Tirante v Nick Chappell | 6-3,6-4 |
| Orlando, USA | 2021/06/06 14:00 | Harrison, Ryan v Nick Chappell | 2-6,6-7 |
| Challenger - Little Rock | 2021/06/02 16:30 | Kelly, Dayne v Nick Chappell | 6-1,7-5 |
| ITF - M25 Pensacola | 2021/05/19 16:50 | Nick Chappell v Mesquida Berg, Oscar | 5-7,6-4,3-6 |
| Challenger Salinas 2 | 2021/04/28 16:35 | Nick Chappell v Wang, Tak Khunn | 6-3,1-6,5-7 |
| Challenger Salinas | 2021/04/20 15:50 | Nick Chappell v Ortega-Olmedo, Roberto | 3-6,2-6 |
| Challenger Oeiras Qual | 2021/04/04 15:10 | Nick Chappell v Henrique Rocha | 4-6,2-6 |
| Marbella, Spain | 2021/03/29 09:00 | Javier Barranco Cosano v Nick Chappell | 6-2,7-6 |
| 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 - M15 Manacor | 2021/01/14 09:00 | Daniel Rincon v Doumbia, Sadio | 4-6,2-6 |
| ITF - M15 Manacor | 2021/01/13 13:20 | Nicolas Mejia v Doumbia, Sadio | 6-7,1-6 |