Stadium: Court 1 Round: 28 Ground: Clay
| Prostejov, Singles M-ITF-CZE-04A | 2021/08/19 10:10 | Zsombor Piros v Nikolas Sanchez Izquierdo | 6-4,6-7,2-6 |
| Prostejov, Singles M-ITF-CZE-04A | 2021/08/18 08:00 | Martin Krumich v Nikolas Sanchez Izquierdo | 0-6,2-6 |
| Prostejov, Singles M-ITF-CZE-04A | 2021/08/17 10:35 | Panik, Matej v Nikolas Sanchez Izquierdo | 0-6,2-6 |
| San Marino, San Marino | 2021/08/09 12:45 | Orlando Luz v Nikolas Sanchez Izquierdo | 6-1,6-7,6-2 |
| San Marino, San Marino | 2021/08/08 12:10 | Matteo Arnaldi v Nikolas Sanchez Izquierdo | 1-6,6-4,3-6 |
| Cordenons, Italy | 2021/08/01 13:35 | Forti, Francesco v Nikolas Sanchez Izquierdo | 7-6,2-6,6-3 |
| Segovia, Spain | 2021/07/27 16:35 | Lopez, Feliciano v Nikolas Sanchez Izquierdo | 6-4,7-6 |
| Iasi, Romania | 2021/07/12 11:35 | Nikolas Sanchez Izquierdo v Nicholas David Ionel | 3-6,6-4,2-6 |
| Prostejov, Singles M-ITF-CZE-04A | 2021/08/19 08:15 | Alex Rybakov v Nick Chappell | 6-2,7-6 |
| Prostejov, Singles M-ITF-CZE-04A | 2021/08/18 07:55 | Alex Rybakov v Marek Gengel | 6-3,6-3 |
| Prostejov, Singles M-ITF-CZE-04A | 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 | Bangoura, Sekou v Alex Rybakov | 1-6,4-6 |
| ITF M25 Decatur | 2021/08/04 17:25 | Farren, Connor v Alex Rybakov | 5-7,1-6 |
| ATP - Los Cabos | 2021/07/19 00:00 | Ernesto Escobedo v Alex Rybakov | 6-2,7-6 |