Stadium: Court 1 Round: 26 Ground: Hardcourt indoor
| ITF Israel F4 | 2018/04/25 10:00 | Johannes Haerteis v Patrik Niklas-Salminen | 4-6,7-6,4-6 |
| Challenger Drummondville | 2020/02/18 23:05 | Goncalo Oliveira v Johannes Haerteis | 6-7,1-6 |
| Challenger Drummondville | 2020/02/17 17:45 | Johannes Haerteis v Tony Bourcet | 6-2,6-0 |
| ITF M25 Nussloch | 2020/01/24 19:00 | Johannes Haerteis v Ruben Bemelmans | 4-6,3-6 |
| ITF M25 Nussloch | 2020/01/23 10:55 | Giulio Zeppieri v Johannes Haerteis | 6-3,3-6,6-7 |
| ITF M25 Nussloch | 2020/01/22 12:50 | Jakob Aichhorn v Johannes Haerteis | 2-6,6-4,4-6 |
| ITF M15 Manacor | 2020/01/15 12:35 | Johannes Haerteis v Pablo Llamas Ruiz | 3-6,4-6 |
| ITF M15 Prague | 2019/11/06 14:40 | Oleksii Krutykh v Johannes Haerteis | 4-6,7-6,6-2 |
| Challenger Eckental | 2019/10/29 09:00 | John-Patrick Smith v Johannes Haerteis | 7-6,6-7,7-6 |
| Challenger Drummondville | 2020/02/18 18:50 | Patrik Niklas-Salminen v Go Soeda | 7-6,6-4 |
| Challenger Drummondville | 2020/02/16 21:25 | Kaichi Uchida v Patrik Niklas-Salminen | 1-6,7-6,5-7 |
| ITF M25 Barnstaple | 2020/02/14 10:30 | Kacper Zuk v Patrik Niklas-Salminen | 6-4,6-7,6-3 |
| ITF M25 Barnstaple | 2020/02/13 09:55 | Patrik Niklas-Salminen v Mark Whitehouse | 6-4,6-1 |
| ITF M25 Barnstaple | 2020/02/12 10:00 | Patrik Niklas-Salminen v Wojciech Marek | 6-3,6-1 |
| ITF M25 Barnstaple | 2020/02/11 16:20 | Patrik Niklas-Salminen v Alexis Canter | 6-4,6-1 |
| Challenger Rennes | 2020/01/21 16:00 | Patrik Niklas-Salminen v Tobias Kamke | 4-6,1-6 |
| Challenger Rennes | 2020/01/20 16:15 | Patrik Niklas-Salminen v Luca Vanni | 6-3,6-4 |