Stadium: Court 5 Round: 54 Ground: Carpet indoor
| ITF M25 Sarreguemines | 2023/10/26 08:00 | Opitz, Jannik v 술타노브, 쿠모윤 | 5-7,2-6 |
| ITF M25 Sarreguemines | 2023/10/25 08:00 | 빌레그자닌, 니콜라이 v Opitz, Jannik | 6-7,6-4,2-6 |
| ITF M25 Sarreguemines | 2023/10/23 12:05 | Opitz, Jannik v Yanis Ghazouani Durand | 7-6,6-3 |
| ITF M15 Villers Les Nancy | 2023/10/18 10:45 | 카우티엘, 알렉시스 v Opitz, Jannik | 1-6,6-3,6-2 |
| ITF M15 Trier | 2023/08/24 10:55 | Stepan Baum v Opitz, Jannik | 6-2,6-2 |
| ITF M15 Trier | 2023/08/23 11:00 | David Eichenseher v Opitz, Jannik | 6-4,6-7,4-6 |
| ITF M25 Wetzlar | 2023/08/03 08:00 | 스첼, 니클라스 v Opitz, Jannik | 6-4,6-4 |
| ITF M15 Uslar | 2023/07/19 10:00 | Opitz, Jannik v 브루나, 에스테반 | 2-6,4-6 |
| ITF M15 Sharm El Sheikh | 2023/10/15 12:00 | Lukas Janousek v Leonardo Borrelli | 6-2,4-6,6-10 |
| ITF M15 Sharm El Sheikh | 2023/10/08 07:00 | Macherla, Theertha Shashank v Lukas Janousek | 6-7,2-6 |
| ITF M25 Jablonec Nad Nisou | 2023/08/28 09:00 | Lukas Janousek v Patrik Homola | 2-6,6-7 |
| ITF M15 Trier | 2023/08/21 09:30 | Freek Van Donselaar v Lukas Janousek | 6-4,7-6 |
| ITF M15 Uslar | 2023/07/17 10:30 | 스펠레, 존 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 |