Stadium: Court 2 Round: 25 Ground: Hardcourt indoor
| ITF M25 Esch/Alzette | 2023/07/17 15:20 | 덴 헤이젤, 구이 v William Jucha | 6-4,7-5 |
| ITF M25 Esch/Alzette | 2023/07/17 08:40 | 덴 헤이젤, 구이 v Mats Bredschneijder | 4-6,6-2,10-6 |
| ITF M25 Esch/Alzette | 2023/07/10 09:30 | Brian Bozemoj v 덴 헤이젤, 구이 | 6-2,4-6,16-14 |
| ITF M25 The Hague | 2023/07/07 11:35 | 반셀보임, 에릭 v 덴 헤이젤, 구이 | 6-2,6-2 |
| ITF M25 The Hague | 2023/07/06 09:00 | Fons Van Sambeek v 덴 헤이젤, 구이 | 4-6,6-1,2-6 |
| ITF M15 Alkmaar | 2023/06/25 10:00 | 덴 헤이젤, 구이 v Stijn Paardekooper | 4-6,6-4,12-14 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/22 11:30 | 웨스트라트, 로데비직 v 덴 헤이젤, 구이 | 7-6,6-4 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/21 13:20 | David Fix v 덴 헤이젤, 구이 | 6-4,6-7,2-6 |
| ITF M25 Klosters | 2023/07/04 07:00 | Jan Sebesta v Dylan Dietrich | 4-6,6-7 |
| ITF M25 Klosters | 2023/07/03 11:15 | Jan Sebesta v Andrin Casanova | 2-6,2-6 |
| ITF M25 Klosters | 2023/07/02 13:00 | Jan Sebesta v 카도나우, 야콥 | 6-2,6-3 |
| ITF M25 Toulouse | 2023/03/22 13:00 | Loann Massard v Jan Sebesta | 6-1,6-3 |
| ITF M25 Toulouse | 2023/03/21 11:15 | Jan Sebesta v Paul Barbier Gazeu | 3-6,6-2,10-6 |
| ITF M25 Toulouse | 2023/03/20 15:10 | Jan Sebesta v Romain Vial | 6-3,6-2 |
| Trimbach, Singles M-ITF-SUI-01A | 2023/03/15 13:05 | Jan Sebesta v 주카예브, 베이비트 | 6-7,2-6 |
| Trimbach, Singles M-ITF-SUI-01A | 2023/03/14 12:40 | Jan Sebesta v Sacha Ouzilou | 7-5,7-5 |