Stadium: Court 2 Round: 19 Ground: Hardcourt outdoor
| ITF M25 Kashiwa | 2023/04/05 04:30 | Shuichi Sekiguchi v Tatsuma Ito | 4-6,6-3,7-5 |
| ITF M25 Lucknow | 2023/03/22 04:00 | Shuichi Sekiguchi v Karan Singh | 3-6,4-6 |
| ITF M25 New Delhi | 2023/03/16 05:30 | Yunseok Jang v Shuichi Sekiguchi | 2-6,7-5,6-3 |
| ITF M25 New Delhi | 2023/03/15 09:55 | Woobin Shin v Shuichi Sekiguchi | 7-5,5-7,3-6 |
| ITF M15 Aktobe | 2023/03/02 09:25 | Federico Bertuccioli v Shuichi Sekiguchi | 7-6,4-6,4-4 |
| ITF M15 Aktobe | 2023/03/01 09:55 | Adrian Oetzbach v Shuichi Sekiguchi | 3-6,4-6 |
| ITF M25 Burnie | 2023/02/09 00:50 | Adam Walton v Shuichi Sekiguchi | 6-1,6-7,7-6 |
| ITF M25 Burnie | 2023/02/08 04:00 | Shuichi Sekiguchi v Corey Gaal | 6-2,7-5 |
| ITF M25 Jakarta | 2023/06/01 02:25 | Hiroki Moriya v Markos Kalovelonis | 7-6,6-2 |
| ITF M25 Jakarta | 2023/05/31 03:00 | Markos Kalovelonis v Eric Padgham | 7-6,6-7,6-3 |
| ITF M15 Alaminos-Larnaca | 2023/05/09 07:00 | Markos Kalovelonis v Vlad Andrei Dancu | 3-6,6-1,6-7 |
| ITF M15 Heraklion | 2023/03/16 08:20 | Andrea Picchione v Markos Kalovelonis | 6-3,6-1 |
| ITF M15 Heraklion | 2023/03/15 09:50 | Markos Kalovelonis v Jonathan Baron | 6-4,5-7,6-2 |
| UTR Pro Dubai | 2023/02/01 06:30 | Besir Durguti v Markos Kalovelonis | 4-6,7-6,6-1 |
| UTR Pro Dubai | 2023/01/31 05:00 | Mihai Razvan Marinescu v Markos Kalovelonis | 4-6,7-5,7-6 |
| UTR Pro Athens | 2022/08/01 06:30 | Aleksandr Kalinin v Markos Kalovelonis | 3-6,3-6 |