| 3. Liga 2018/2019 - Appearances as Assistant | ||||
| 03/08/2018 | Hansa Rostock | - | Eintracht Braunschweig | 2:0 |
| 10/08/2018 | Karlsruher SC | - | FC Carl Zeiss Jena | 1:1 |
| 18/05/2019 | Sportfreunde Lotte | - | Würzburger Kickers | 1:2 |
| 3. Liga 2018/2019 - Appearances as Assistant | ||||
| 03/08/2018 | Hansa Rostock | - | Eintracht Braunschweig | 2:0 |
| 10/08/2018 | Karlsruher SC | - | FC Carl Zeiss Jena | 1:1 |
| 18/05/2019 | Sportfreunde Lotte | - | Würzburger Kickers | 1:2 |
| Complete name: | Julius Martenstein |
| Born: | 16/10/1991 |
| Place of birth: |
Germany |
| Residence: | Marburg |
| Nationality: |
Germany |