| ITF M15 Monastir | 2021/04/26 09:00 | Marius Ruzgas v Viktor Jovic | 3-6,3-6 |
| ITF M15 Monastir | 2021/04/25 12:30 | Marius Ruzgas v Mhamed Affes | 6-1,6-2 |
| ITF M15 Monastir | 2021/04/18 13:00 | Lorenzo Bresciani v Marius Ruzgas | 7-6,6-3 |
| ITF M15 Monastir | 2021/04/11 12:00 | Marius Ruzgas v Samuel Puskar | 4-6,6-7 |
| ITF M15 Monastir | 2021/04/07 09:55 | Marius Ruzgas v Aziz Ouakaa | 3-6,4-6 |
| ITF M15 Monastir | 2021/04/05 13:30 | Dorian Kos v Marius Ruzgas | 2-6,6-7 |
| ITF M15 Monastir | 2021/04/05 09:00 | Luca Fantini v Marius Ruzgas | 3-6,6-3,6-10 |
| ITF M15 Monastir | 2021/04/04 11:30 | Imran Sibille v Marius Ruzgas | 3-6,2-6 |
| UTR Pro Tennis Series Bucharest | 2021/06/04 11:30 | Warren Sinius v Valentin Vanta | 0-6,2-6 |
| UTR Pro Tennis Series Bucharest | 2021/06/03 07:30 | Marcelo Zormann v Warren Sinius | 6-0,6-0 |
| UTR Pro Tennis Series Bucharest | 2021/06/02 12:00 | Ihor Dudun v Warren Sinius | 4-6,0-6 |
| UTR Pro Tennis Series Bucharest | 2021/05/30 13:00 | Mihai Razvan Marinescu v Warren Sinius | 6-4,6-1 |
| ITF M15 Marbella | 2021/05/23 12:30 | Jose Dominguez Alonso v Warren Sinius | 6-2,2-6,10-6 |
| UTR Pro Tennis Series Barcelona | 2021/05/01 11:00 | Warren Sinius v Fermin Calvo Barcelo | 0-6,0-5 |
| UTR Pro Tennis Series Barcelona | 2021/04/30 12:30 | Kuzey Cekirge v Warren Sinius | 5-7,6-0,6-4 |
| UTR Pro Tennis Series Barcelona | 2021/04/29 10:00 | Thomas Laurent v Warren Sinius | 6-1,5-1 |