Stadium: Court C Round: 26 Ground: Clay
| ITF M25 Prostejov | 2021/08/17 09:00 | Alex Rybakov v David Poljak | 7-6,7-6 |
| ITF M25 Decatur | 2021/08/07 14:45 | Eliot Spizzirri v Alex Rybakov | 6-4,7-5 |
| ITF M25 Decatur | 2021/08/06 15:00 | Alex Rybakov v Gijs Brouwer | 7-5,6-3 |
| ITF M25 Decatur | 2021/08/05 17:40 | Sekou Bangoura v Alex Rybakov | 1-6,4-6 |
| ITF M25 Decatur | 2021/08/04 17:25 | Connor Farren v Alex Rybakov | 5-7,1-6 |
| ATP Los Cabos | 2021/07/19 00:00 | Ernesto Escobedo v Alex Rybakov | 6-2,7-6 |
| ATP Los Cabos | 2021/07/18 02:40 | Gage Brymer v Alex Rybakov | 3-6,4-6 |
| ITF M25 Klosters | 2021/06/23 07:00 | Alex Rybakov v Leandro Riedi | 6-3,6-7,2-6 |
| ITF M25 Prostejov | 2021/08/17 07:55 | Marek Gengel v Christopher Patzanovsky | 6-2,6-0 |
| Challenger Prague | 2021/08/08 11:20 | Marek Gengel v Emilio Nava | 4-6,3-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/04 15:00 | Philip Bachmaier v Marek Gengel | 6-3,6-4 |
| ITF M15 Castelo Branco | 2021/07/29 13:15 | Marek Gengel v Daniel Batista | 4-6,6-3,3-6 |
| ITF M15 Castelo Branco | 2021/07/28 08:30 | Marek Gengel v Ray Ho | 6-2,2-6,6-3 |
| 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 |