Stadium: Center Court Round: 27 Ground: Hardcourt outdoor
| Challenger Nur-Sultan | 2021/02/24 11:10 | Martin Klizan v Ulises Blanch | 6-7,6-2,7-6 |
| Challenger Nur-Sultan | 2021/02/22 09:30 | Martin Klizan v Timofey Skatov | 6-4,4-6,7-6 |
| Challenger Biella | 2021/02/17 17:05 | Martin Klizan v Andreas Seppi | 6-7,3-6 |
| Challenger Biella | 2021/02/15 14:35 | Bernabe Zapata Miralles v Martin Klizan | 6-7,4-6 |
| Challenger Biella | 2021/02/09 10:50 | Martin Klizan v Illya Marchenko | 2-6,6-7 |
| Australian Open | 2021/01/10 11:45 | Felipe Meligeni Rodrigues Alves v Martin Klizan | 6-1,6-4 |
| Challenger Ortisei | 2020/11/19 13:20 | Martin Klizan v Tomas Machac | 4-6,2-6 |
| Challenger Ortisei | 2020/11/17 13:50 | Martin Klizan v Giulio Zeppieri | 6-1,6-3 |
| Challenger Nur-Sultan | 2021/02/25 05:00 | Brayden Schnur v Prajnesh Gunneswaran | 6-3,3-6,0-6 |
| Challenger Nur-Sultan | 2021/02/24 08:30 | Dostanbek Tashbulatov v Prajnesh Gunneswaran | 2-6,3-6 |
| Challenger Potchefstroom | 2021/02/15 10:50 | Prajnesh Gunneswaran v Akira Santillan | 3-6,6-3,5-7 |
| Challenger Potchefstroom | 2021/02/09 10:15 | Prajnesh Gunneswaran v Dimitar Kuzmanov | 3-6,4-6 |
| Australian Open | 2021/01/12 13:10 | Prajnesh Gunneswaran v Constant Lestienne | 2-6,3-6 |
| Australian Open | 2021/01/11 12:20 | Prajnesh Gunneswaran v Brayden Schnur | 6-4,4-6,6-2 |
| Challenger Orlando | 2020/11/22 16:00 | Brandon Nakashima v Prajnesh Gunneswaran | 6-3,6-4 |
| Challenger Orlando | 2020/11/21 16:00 | Prajnesh Gunneswaran v Christopher Eubanks | 6-4,7-6 |