Stadium: Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/11/01 09:00 | Josh Reid v Greif, Jonas | 7-5,3-6,13-11 |
| ITF - M15 Monastir | 2021/10/31 11:30 | Greif, Jonas v Mohamed Amin Oueslati | 7-6,6-2 |
| ITF - M15 Monastir | 2021/10/25 09:00 | Vasiliauskas, Matas v Greif, Jonas | 6-2,6-3 |
| ITF - M15 Monastir | 2021/10/17 09:30 | Greif, Jonas v Raman, Rishabdev | 5-7,1-6 |
| ITF M15 Bad Waltersdorf | 2021/08/30 07:00 | Spec, Matic v Greif, Jonas | 6-0,6-1 |
| ITF M15 Warmbad-Villach | 2021/08/15 07:00 | Greif, Jonas v Gabriel Decamps | 0-6,2-6 |
| ITF M25 Bolzano | 2021/08/03 15:35 | Petros Tsitsipas v Greif, Jonas | 6-3,6-2 |
| ITF - M15 Monastir | 2021/04/18 10:00 | Leyton Rivera v Greif, Jonas | 6-1,6-2 |
| ITF M25 Villers Les Nancy | 2021/11/10 15:30 | Antoine Vincent v Arthur Gea | 3-6,4-6 |
| ITF M25 Villers Les Nancy | 2021/11/08 12:05 | Antoine Vincent v Matt Ponchet | 6-4,3-6,10-2 |
| ITF - M25 Saint-Dizier | 2021/11/02 12:15 | Li Tu v Antoine Vincent | 7-5,6-1 |
| ITF - M25 Saint-Dizier | 2021/11/01 13:00 | Antoine Vincent v Ajavon, Liova | 5-7,6-4,10-7 |
| ITF - M25 Saint-Dizier | 2021/10/31 15:15 | Amaury Raynel v Antoine Vincent | 4-6,4-6 |
| ITF M25 Sarreguemines | 2021/10/24 14:00 | Antoine Vincent v Tom Schonenberg | 3-6,4-6 |
| ITF M25 Plaisir | 2021/09/12 08:00 | Adan Freire Da Silva v Antoine Vincent | 6-4,6-1 |
| ITF - M15 Monastir | 2021/05/31 08:00 | Antoine Vincent v Masamichi Imamura | 4-6,6-7 |