Stadium: Hard 20 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Héraklion | 2021/05/31 06:30 | Hajek, Petr v Boyer, Toby D | 4-6,7-6,6-10 |
| ITF - M15 Héraklion | 2021/05/30 09:00 | Hajek, Petr v Stepanian, Areg | 7-5,6-2 |
| ITF - M15 Héraklion | 2021/05/23 10:00 | Hajek, Petr v Menelaos Efstathiou | 3-6,2-6 |
| ITF - M15 Héraklion | 2021/05/17 07:00 | Hajek, Petr v Evangelos Kypriotis | 6-4,0-6,8-10 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/20 09:15 | Hajek, Petr v Marino Jakic | 6-4,4-6,1-10 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/19 10:35 | Hajek, Petr v Colacioppo, Giulio | 6-0,6-2 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/18 10:00 | Hajek, Petr v Jan Jermar | 6-2,6-1 |
| ITF - M15 Sharm El Sheikh | 2021/03/25 09:35 | Hajek, Petr v Yu Hsiou Hsu | 3-6,2-6 |
| ITF - M15 Héraklion | 2021/05/31 06:30 | Papounidis, Ioannis v Uzhylovsky, Vladimir | 3-6,5-7 |
| ITF - M15 Héraklion | 2021/05/30 06:30 | Josef Southcombe v Papounidis, Ioannis | 6-7,6-4,6-10 |
| ITF - M15 Héraklion | 2021/05/23 06:30 | Papounidis, Ioannis v Harry Wendelken | 6-4,3-6,3-10 |
| ITF Greece F7 | 2018/11/03 10:00 | Garcia, Mathieu v Papounidis, Ioannis | 6-1,6-2 |
| ITF Greece F6 | 2018/10/29 07:30 | Papounidis, Ioannis v Gostincar, Domen | 3-6,3-6 |
| ITF Greece F6 | 2018/10/28 07:30 | Hiramatsu, Shinnosuke v Papounidis, Ioannis | 7-5,1-6,0-6 |
| ITF Spain F29 | 2018/09/22 07:00 | Papounidis, Ioannis v Roumane, Rayane | 3-6,1-6 |
| ITF Spain F18 Qual | 2018/07/07 12:30 | Joffrey De Schepper v Papounidis, Ioannis | 6-1,6-2 |