Stadium: VOLKSBANK Court Round: 27 Ground: Clay
| ITF M25 Ueberlingen | 2021/08/19 15:05 | Vidal Azorin, Jose Fco v Harrison, Ryan | 2-6,3-6 |
| ITF M25 Ueberlingen | 2021/08/17 15:00 | Mariano Kestelboim v Harrison, Ryan | 3-6,6-4,2-6 |
| Challenger Cary | 2021/07/18 15:00 | Liam Draxl v Harrison, Ryan | 3-6,7-6,6-7 |
| Newport, USA | 2021/07/12 16:00 | Alex Bolt v Harrison, Ryan | 6-0,6-7,7-5 |
| Newport, USA | 2021/07/11 16:45 | Harrison, Ryan v Christopher Eubanks | 7-6,6-7,7-6 |
| Weston, FL, Singles M-ITF-USA-05A | 2021/07/04 15:00 | Harrison, Ryan v Stefan Kozlov | 7-5,3-6,3-6 |
| Weston, FL, Singles M-ITF-USA-05A | 2021/07/03 18:00 | Lopez Villasenor, Gerardo v Harrison, Ryan | 1-6,4-6 |
| Weston, FL, Singles M-ITF-USA-05A | 2021/07/02 21:10 | Harrison, Ryan v Nicolas Mejia | 6-3,6-4 |
| ITF M25 Ueberlingen | 2021/08/19 10:00 | Niklas Schell v Esteve Lobato, Eduard | 6-7,1-6 |
| ITF M25 Ueberlingen | 2021/08/18 12:30 | Hendrik Jebens v Esteve Lobato, Eduard | 6-7,3-6 |
| ITF M25 Frankfurt am Main | 2021/08/15 10:00 | Yshai Oliel v Esteve Lobato, Eduard | 6-7,2-6 |
| ITF M25 Frankfurt am Main | 2021/08/14 09:00 | Oriol Roca Batalla v Esteve Lobato, Eduard | 6-3,1-6,5-7 |
| ITF M25 Frankfurt am Main | 2021/08/13 11:45 | Esteve Lobato, Eduard v Daniel Cukierman | 6-3,6-2 |
| ITF M25 Frankfurt am Main | 2021/08/12 08:50 | Esteve Lobato, Eduard v Gomez, Alejandro | 6-3,6-4 |
| ITF M25 Frankfurt am Main | 2021/08/11 09:00 | Esteve Lobato, Eduard v Sanchez Martinez, Benito | 6-2,6-3 |
| ITF M25 Denia | 2021/07/31 16:00 | Esteve Lobato, Eduard v Nick Hardt | 6-7,3-6 |