Stadium: Court 19 Round: 54 Ground: Clay
| ITF M15 Eupen | 2023/08/07 07:00 | Freek Van Donselaar v Stijn Pel | 2-6,0-6 |
| ITF M15 Metzingen | 2023/07/23 07:30 | Freek Van Donselaar v Arthur Nagel | 3-6,6-3,6-10 |
| ITF M25 Esch/Alzette | 2023/07/10 17:30 | Marlon Vankan v Freek Van Donselaar | 6-2,6-3 |
| ITF M25 Esch/Alzette | 2023/07/10 12:50 | Freek Van Donselaar v Andreja Petrovic | 6-3,6-4 |
| ITF M25 Esch/Alzette | 2023/07/09 14:00 | Umberto Maria Giovannini v Freek Van Donselaar | 6-4,1-6,4-10 |
| UTR Pro Tennis Series Blaricum | 2022/11/19 07:00 | Freek Van Donselaar v Ole Bredschneijder | 0-6,3-5 |
| UTR Pro Tennis Series Easton | 2022/11/05 08:00 | Freek Van Donselaar v Federico Scotuzzi | 6-4,1-6,4-6 |
| UTR Pro Tennis Series Easton | 2022/11/04 11:00 | Freek Van Donselaar v James Beaven | 3-6,3-6 |
| ITF M15 Uslar | 2023/07/17 10:30 | John Sperle v Lukas Janousek | 6-0,6-4 |
| ITF M15 Kamen | 2023/06/26 14:00 | Ruben Hartig v Lukas Janousek | 6-4,6-1 |
| ITF M15 Kamen | 2023/06/26 10:00 | Lukas Janousek v Luca Hesselmann | 6-4,6-3 |
| ITF M25 Jablonec Nad Nisou | 2023/05/30 09:30 | Matthew William Donald v Lukas Janousek | 6-0,6-2 |
| ITF M25 Jablonec Nad Nisou | 2023/05/29 10:30 | Lukas Janousek v Filip Apltauer | 7-5,2-6,12-10 |
| ITF M25 Most | 2023/05/23 09:50 | Michael Agwi v Lukas Janousek | 6-1,6-3 |
| ITF M25 Most | 2023/05/21 08:00 | Sergo Sikharulidze v Lukas Janousek | 3-6,4-6 |
| ITF M15 Meerbusch | 2023/04/23 10:30 | Quin Verstegen v Lukas Janousek | 4-6,6-4,10-8 |