Estadio: Court 3 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Parnu | 2021/10/25 07:00 | Roman Ruenger v Timofey Stepanov | 2-6,1-6 |
| ITF M25 Ricany | 2021/08/29 10:30 | Roman Ruenger v Filip Kana | 4-6,2-6 |
| ITF M15 Sibenik | 2021/05/17 14:40 | Rimpei Kawakami v Roman Ruenger | 6-2,6-2 |
| ITF M15 Sibenik | 2021/05/16 12:30 | Liam Schiemann v Roman Ruenger | 3-6,2-6 |
| ITF Holanda F5 | 2018/08/18 08:00 | Kevin Kaczynski v Roman Ruenger | 6-1,6-0 |
| ITF M15 Monastir | 2021/11/29 10:30 | Mattias Southcombe v Antoine Vincent | 4-6,3-6 |
| ITF M15 Monastir | 2021/11/22 12:30 | Mattias Southcombe v Edward Winter | 6-7,2-6 |
| ITF M15 Monastir | 2021/11/22 08:00 | Nikita Volonski v Mattias Southcombe | 1-6,6-3,7-10 |
| ITF M15 Monastir | 2021/11/15 08:00 | Tao Mu v Mattias Southcombe | 6-0,6-2 |
| ITF M15 Monastir | 2021/11/14 12:30 | Max Cunat v Mattias Southcombe | 1-6,6-2,6-10 |
| ITF M15 Sozopol | 2021/10/10 14:30 | Scott Duncan v Mattias Southcombe | 7-5,6-3 |
| ITF M15 Monastir | 2021/10/05 09:50 | Mattias Southcombe v Raphael Collignon | 4-6,2-6 |
| ITF M15 Monastir | 2021/09/27 08:00 | Mayeul Darras v Mattias Southcombe | 6-3,6-4 |