Stadium: Court 5 Round: 25 Ground: Clay
| ITF Turkey F23 MD | 2016/06/08 11:30 | Paul Woerner v Sieber, Marc | 2-6,0-6 |
| ITF Turkey F38 | 2014/10/30 08:00 | Sieber, Marc v Paul Woerner | 6-1,6-3 |
| ITF Italy F6 | 2018/04/03 14:15 | Galarza, Juan Ignacio v Paul Woerner | 6-1,7-6 |
| ITF Italy F6 Qual | 2018/04/02 14:25 | Paul Woerner v Aguilar, Federico Juan | 6-0,6-1 |
| ITF Italy F6 Qual | 2018/04/01 12:00 | Paul Woerner v Makiguchi, Ryusei | 6-4,6-4 |
| ITF Italy F5 | 2018/03/29 16:35 | Lorenzo Giustino v Paul Woerner | 4-6,6-3,7-5 |
| ITF Italy F5 | 2018/03/28 11:55 | Paul Woerner v Marco Miceli | 2-6,6-4,6-3 |
| ITF Greece F3 | 2018/03/14 10:10 | Paul Woerner v Sude, Jakob | 3-6,1-6 |
| ITF Tunisia F7 | 2018/02/22 08:30 | Paul Woerner v Krawietz, Kevin | 2-6,3-6 |
| ITF Tunisia F7 | 2018/02/21 09:00 | Paul Woerner v Louis Tessa | 5-7,6-1,6-1 |
| Turkey F14, Singles Qualifying | 2018/04/13 07:30 | Pospisil, Jaroslav v Sieber, Marc | 6-2,6-4 |
| Turkey F14, Singles Qualifying | 2018/04/12 09:35 | Jordan Correia Passos Do Carmo v Sieber, Marc | 4-6,6-4,1-6 |
| ITF Portugal F5 | 2018/03/21 17:15 | Monteiro, Joao v Sieber, Marc | 5-7,6-3,6-2 |
| Portugal F4, Singles Qualifying | 2018/03/14 11:40 | Sieber, Marc v Alejandro Davidovich Fokina | 3-6,3-6 |
| Portugal F4, Singles Qualifying | 2018/03/13 12:25 | Sieber, Marc v Yann Marti | 6-2,0-6,6-1 |
| Turkey F8, Singles Qualifying | 2018/03/01 09:30 | Sieber, Marc v Miladinovic, Marko | 6-7,6-4,4-6 |
| Turkey F8, Singles Qualifying | 2018/02/28 08:30 | Sieber, Marc v Davydov, Ivan | 6-3,6-3 |
| Challenger Bergamo Qual | 2018/02/18 10:50 | Sieber, Marc v Jankovits, Yannick | 2-6,6-3,3-6 |