Stadium: Court 8 Round: 44 Ground: Clay
| 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 Netherlands F5 | 2018/08/18 08:00 | Kevin Kaczynski v Roman Ruenger | 6-1,6-0 |
| ITF M25 Prostejov | 2021/08/15 08:00 | Filip Kana v Victor Sklenka | 1-6,1-6 |
| ITF M25 Kottingbrunn | 2021/07/19 12:20 | Filip Kana v Gabriele Datei | 1-6,3-6 |
| ITF M15 Sharm El Sheikh | 2021/03/21 11:30 | Filip Kana v Ben Jones | 0-6,3-6 |
| ITF M15 Sharm El Sheikh | 2021/03/15 11:30 | Daniel Little v Filip Kana | 6-3,6-2 |