Stadium: Court 7 Round: 19 Ground: Clay
| Challenger Braunschweig | 2021/07/04 10:10 | Igor Sijsling v Diego Hidalgo | 3-6,6-3,4-6 |
| ITF M25 Tulsa | 2021/06/17 14:00 | Nicolas Kicker v Diego Hidalgo | 6-4,7-5 |
| ITF M25 Tulsa | 2021/06/16 17:10 | Strong Kirchheimer v Diego Hidalgo | 7-6,2-6,3-6 |
| ITF M25 Santo Domingo | 2021/06/10 12:50 | Evan Zhu v Diego Hidalgo | 6-2,6-3 |
| ITF M25 Santo Domingo | 2021/06/09 13:00 | Adam El Mihdawy v Diego Hidalgo | 4-6,6-7 |
| ITF M25 Santo Domingo | 2021/06/03 15:55 | Kyle Seelig v Diego Hidalgo | 6-2,6-4 |
| ITF M25 Santo Domingo | 2021/06/01 15:55 | Gerardo L Villasenor v Diego Hidalgo | 6-4,3-6,3-6 |
| Challenger Salinas 2 | 2021/04/27 16:15 | Adrian Menendez-Maceiras v Diego Hidalgo | 7-5,6-0 |
| ITF M25 The Hague | 2021/07/01 14:05 | Dayne Kelly v Marko Tepavac | 6-7,3-6 |
| ITF M25 The Hague | 2021/06/29 15:00 | Dayne Kelly v Guy Den Heijer | 6-1,6-4 |
| ITF M25 Montauban | 2021/06/24 10:00 | Valentin Royer v Dayne Kelly | 7-6,6-2 |
| ITF M25 Montauban | 2021/06/23 08:25 | Loris Pourroy v Dayne Kelly | 4-6,4-6 |
| Challenger Orlando | 2021/06/08 16:00 | Dayne Kelly v Guido Andreozzi | 6-4,4-6,5-7 |
| Challenger Orlando | 2021/06/07 16:00 | Sekou Bangoura v Dayne Kelly | 6-7,3-6 |
| Challenger Orlando | 2021/06/06 19:00 | Dayne Kelly v Michael Redlicki | 6-2,6-1 |
| Challenger Little Rock | 2021/06/03 17:00 | Dayne Kelly v Oliver Crawford | 4-6,1-6 |