Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF - M25 Idanha-A-Nova | 2021/07/22 11:45 | Clement Chidekh v Marek Gengel | 6-4,7-6 |
| ITF - M25 Idanha-A-Nova | 2021/07/21 08:00 | Joao Lucas Reis da Silva v Marek Gengel | 5-7,0-6 |
| Challenger - Aix en Provence | 2021/06/13 10:00 | Marek Gengel v Eduard Esteve Lobato | 0-6,1-6 |
| ITF - M15 Gaiba | 2021/06/08 13:50 | Marek Gengel v Mats Rosenkranz | 6-4,5-7,1-6 |
| ITF - M25 Most | 2021/05/26 09:35 | Antonin Bolardt v Marek Gengel | 7-6,6-0 |
| ITF - M15 Tbilisi | 2021/05/21 06:00 | Alexander Shevchenko v Marek Gengel | 6-7,6-4,6-4 |
| ITF - M15 Tbilisi | 2021/05/20 09:40 | Aidan Mayo v Marek Gengel | 3-6,2-6 |
| ITF - M15 Tbilisi | 2021/05/18 07:00 | Marat Deviatiarov v Marek Gengel | 1-6,4-6 |
| ITF - M25 Idanha-A-Nova | 2021/07/18 14:30 | Ray Ho v Clement Chidekh | 3-6,4-6 |
| ITF - M15 Sofia | 2021/07/04 09:00 | Ray Ho v Martin Dimitrov | 3-6,6-3,5-10 |
| ITF - M15 - Antalya | 2021/06/28 07:55 | Ray Ho v Olexiy Kolisnyk | 6-3,2-6,9-11 |
| ITF - M15 - Antalya | 2021/06/27 06:30 | Ray Ho v Farzin Danny Amiri | 6-2,6-2 |
| ITF - M15 - Antalya | 2021/06/23 11:40 | Ray Ho v Lorenzo Joaquin Rodriguez | 6-3,4-6,4-6 |
| ITF - M15 - Antalya | 2021/06/22 07:00 | Bora Sengul v Ray Ho | 2-6,7-6,9-11 |
| ITF - M15 - Antalya | 2021/06/21 08:45 | Thiago Cigarran v Ray Ho | 0-6,3-6 |
| ITF - M15 - Antalya | 2021/06/20 07:00 | Ivan Kazakov v Ray Ho | 2-6,1-6 |