Stadium: Court 3 Round: 54 Ground: Clay
| ITF - M15 Héraklion | 2019/12/01 12:00 | Dax Donders v Heger, Tim | 4-6,4-6 |
| ITF M15 Haren | 2023/09/07 13:25 | de Bakker, Thiemo v Dax Donders | 7-6,6-2 |
| ITF M15 Haren | 2023/09/06 08:00 | Dax Donders v Alec Deckers | 3-6,6-4,7-6 |
| ITF M25 Oldenzaal | 2023/09/01 11:25 | Dax Donders v Lucas Gerch | 6-4,3-6,1-6 |
| ITF M25 Oldenzaal | 2023/08/31 15:35 | Prechtel, Sebastian v Dax Donders | 6-3,0-6,6-7 |
| ITF M25 Oldenzaal | 2023/08/29 13:25 | Dax Donders v Jans, Jarno | 6-2,6-1 |
| ITF M25 Koksijde | 2023/08/14 15:40 | Dax Donders v Alexander Blockx | 2-6,2-6 |
| ITF M15 Frankfurt Am Main | 2023/08/09 12:20 | Gregor Ramskogler v Dax Donders | 6-3,6-7,6-3 |
| ITF M15 Eindhoven | 2023/08/01 10:30 | Sander Jong v Dax Donders | 6-3,6-3 |
| ITF - M25 Santa Margherita | 2023/09/17 08:30 | Vitali Shvets v Heger, Tim | 1-6,2-6 |
| Maribor, Singles Main, M-ITF-SLO-06A | 2023/09/07 08:00 | Heger, Tim v Mathys Erhard | 3-6,4-6 |
| Maribor, Singles Main, M-ITF-SLO-06A | 2023/09/06 09:35 | Nikita Mashtakov v Heger, Tim | 6-4,4-6,1-6 |
| Maribor, Singles Main, M-ITF-SLO-06A | 2023/09/05 07:50 | Heger, Tim v Enrico Giacomini | 6-3,6-2 |
| Maribor, Singles Main, M-ITF-SLO-06A | 2023/09/04 08:00 | Heger, Tim v Lukas Rohseano | 6-2,6-2 |
| Maribor, Singles Main, M-ITF-SLO-06A | 2023/08/30 13:50 | Heger, Tim v Minin, Matvey | 4-6,1-6 |
| Maribor, Singles Main, M-ITF-SLO-06A | 2023/08/29 09:30 | Heger, Tim v Carlo Angeli | 6-4,6-2 |
| Maribor, Singles Main, M-ITF-SLO-06A | 2023/08/28 12:30 | Heger, Tim v Vito Horvat | 6-2,6-0 |