Stadium: Hard 2 Round: 25 Ground: Hardcourt outdoor
| ITF Germany F16 | 2018/10/25 12:45 | Stefan Seifert v Evgeny Tyurnev | 5-7,4-6 |
| ITF Germany F16 | 2018/10/24 10:00 | Artem Dubrivnyy v Stefan Seifert | 6-2,5-7,1-6 |
| ITF Germany F16 | 2018/10/23 13:00 | Stefan Seifert v Johann Willems | 4-6,6-3,6-2 |
| ITF Germany F15 | 2018/10/12 15:45 | Stefan Seifert v Vadym Ursu | 3-6,1-6 |
| ITF Germany F15 | 2018/10/11 15:25 | Stefan Seifert v Karlo Cubelic | 6-4,6-7,6-2 |
| ITF Germany F15 | 2018/10/10 16:45 | Stefan Seifert v Piotr Galus | 6-1,6-2 |
| ITF Germany F11 | 2018/08/07 09:00 | Constantin Schmitz v Stefan Seifert | 7-5,2-6,6-2 |
| ITF Ireland F1 | 2018/08/04 12:45 | Stefan Seifert v Ryan James Storrie | 3-6,7-6,3-6 |
| ITF Ukraine F4 | 2018/08/26 07:00 | Constantinos Papavasiliou v Oleksandr Varichenko | 0-6,3-6 |
| ITF Germany F11 | 2018/08/05 08:00 | Marvin Rehberg v Constantinos Papavasiliou | 6-1,6-2 |
| ITF Germany F10 Qual | 2018/07/29 10:30 | Constantinos Papavasiliou v Feda Bilic | 0-6,2-6 |
| ITF Germany F9 | 2017/07/30 13:30 | Constantinos Papavasiliou v Benjamin Loccisano | 0-6,2-6 |
| ITF Romania F2 Qual | 2017/05/20 09:00 | Constantinos Papavasiliou v Luca George Tatomir | 2-6,5-7 |
| ITF Greece F4 | 2017/03/25 09:30 | Liam Caruana v Constantinos Papavasiliou | 6-1,6-0 |
| ITF Turkey F51 Qual | 2016/12/19 07:30 | Constantinos Papavasiliou v Nicolas Barz | 0-6,1-6 |
| ITF Cyprus F3 Qual | 2016/11/27 08:30 | Denis Kapric v Constantinos Papavasiliou | 6-1,6-1 |