Stadium: Court 2 Round: 44 Ground: Clay
| ITF M15 Novomoskovsk | 2021/05/23 10:30 | Alcalde, Juan Ignacio v Fellin, Manfred | 7-6,2-6,10-3 |
| ITF M15 Cairo | 2021/04/26 08:00 | Fellin, Manfred v Ragazzi, Alessandro | 3-6,1-6 |
| ITF M15 Cairo | 2021/04/21 09:25 | Capecchi, Daniele v Fellin, Manfred | 6-0,6-4 |
| ITF M15 Cairo | 2021/04/20 08:00 | Luigi Sorrentino v Fellin, Manfred | 6-2,6-2 |
| ITF M15 Cairo | 2021/04/18 17:30 | El Sayed, Ashraf v Fellin, Manfred | 0-6,3-6 |
| ITF M15 Cairo | 2021/04/13 12:30 | Kawakami, Rimpei v Fellin, Manfred | 6-4,6-0 |
| ITF M15 Cairo | 2021/04/12 08:30 | Garmendia Olasagasti, Inigo v Fellin, Manfred | 2-6,2-6 |
| ITF M15 Cairo | 2021/04/11 07:00 | Shohei Chikami v Fellin, Manfred | 6-7,2-6 |
| ITF M15 Novomoskovsk | 2021/05/23 08:00 | Ivanov, Simon Anthony v Leyton Rivera | 6-4,6-2 |
| ITF - M15 Monastir | 2021/04/19 12:00 | Leyton Rivera v Coelho, Fabio | 4-6,2-6 |
| ITF - M15 Monastir | 2021/04/18 10:00 | Leyton Rivera v Greif, Jonas | 6-1,6-2 |
| ITF - M15 Monastir | 2021/04/12 13:00 | Leyton Rivera v Niklas Schell | 4-6,7-6,8-10 |
| ITF - M15 Monastir | 2021/04/12 09:00 | Luca Fantini v Leyton Rivera | 2-6,4-6 |
| ITF - M15 Monastir | 2021/04/04 09:00 | Colin Sinclair v Leyton Rivera | 6-2,6-7,10-3 |
| ITF M15 Bratislava | 2021/03/08 09:00 | Neil Oberleitner v Leyton Rivera | 6-4,6-1 |
| ITF - M15 Monastir | 2021/03/02 10:35 | Carlos Sanchez Jover v Leyton Rivera | 6-2,6-0 |