 Australia: M25 Cairns 2 - Singles - Main |
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| 1/8-finals | Isomura K. | Sekiguchi S. | 2:1 (6:4, 4:6, 6:3) | details | 12.10.2023 |
| 1/16-finals | Papac T. E. | Sekiguchi S. | 0:2 (4:6, 3:6) | details | 10.10.2023 |
 Japan: M25 Sapporo 2 - Singles - Main |
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| Semi-finals | Sekiguchi S. | Nishiwaki K. | 1:2 (6:0, 5:7, 4:6) | details | 16.09.2023 |
| Quarter-finals | Sekiguchi S. | Shiraishi H. | 2:1 (6:2, 4:6, 6:3) | details | 16.09.2023 |
| 1/8-finals | Sekiguchi S. | Yamasaki J. | 2:0 (6:3, 7:5) | details | 15.09.2023 |
| 1/16-finals | Sekiguchi S. | Tanuma R. | 2:0 (7:62, 6:1) | details | 13.09.2023 |
| Japan: M25 Sapporo - Singles - Main |
|---|
| Final | Sekiguchi S. | Sumizawa D. | 2:0 (6:1, 6:4) | details | 10.09.2023 |
| Semi-finals | Nakagawa N. | Sekiguchi S. | 1:2 (7:5, 3:6, 5:7) | details | 09.09.2023 |
| Quarter-finals | Sekiguchi S. | Yamasaki J. | 2:0 (6:4, 6:3) | details | 08.09.2023 |
| 1/8-finals | Sekiguchi S. | Ferguson C. | 2:0 (6:2, 6:2) | details | 07.09.2023 |
| 1/16-finals | Sekiguchi S. | Sakagawa H. | 2:0 (6:3, 6:2) | details | 05.09.2023 |
 China: Zhangjiagang - Singles - Qualification |
|---|
| Final | Sekiguchi S. | Cui J. | 0:2 (1:6, 2:6) | details | 28.08.2023 |
| Semi-finals | Sekiguchi S. | Alcantara F. C. | 2:0 (7:5, 6:3) | details | 27.08.2023 |
| China: Zhuhai - Singles - Main |
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| 1/16-finals | Palan D. | Sekiguchi S. | 2:1 (7:60, 5:7, 6:2) | details | 22.08.2023 |
| China: Zhuhai - Singles - Qualification |
|---|
| Final | Sekiguchi S. | Kalovelonis M. | 2:1 (7:61, 2:6, 6:4) | details | 21.08.2023 |
 Kazakhstan: M25 Astana - Singles - Main |
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| Semi-finals | Takahashi Y. | Sekiguchi S. | 2:0 (6:4, 6:4) | details | 05.08.2023 |
| Quarter-finals | Sekiguchi S. | Agafonov E. | 2:0 (7:61, 6:1) | details | 04.08.2023 |
| 1/8-finals | Sekiguchi S. | Dev S D P. | 2:1 (65:7, 7:5, 6:0) | details | 03.08.2023 |
| 1/16-finals | Rai A. | Sekiguchi S. | 0:2 (2:6, 1:6) | details | 02.08.2023 |
| Kazakhstan: Astana - Singles - Main |
|---|
| 1/16-finals | Sultanov K. | Sekiguchi S. | 2:0 (7:65, 6:4) | details | 24.07.2023 |
 Thailand: M15 Nakhon Si Thammarat 3 - Singles - Main |
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| Quarter-finals | Sekiguchi S. | Jones M. | 1:2 (4:6, 7:63, 5:7) | details | 07.07.2023 |
| 1/8-finals | Sekiguchi S. | Ichikawa T. | 2:0 (6:2, 6:2) | details | 06.07.2023 |
| 1/16-finals | Sekiguchi S. | Chaiyarin C. | 2:0 (6:2, 6:4) | details | 05.07.2023 |
 Indonesia: M15 Jakarta 5 - Singles - Main |
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| 1/16-finals | Bouzige M. | Sekiguchi S. | 2:0 (7:5, 6:3) | details | 28.06.2023 |
| Indonesia: M15 Jakarta 4 - Singles - Main |
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| Quarter-finals | M Rifqi F. | Sekiguchi S. | 2:1 (0:6, 6:3, 7:65) | details | 23.06.2023 |
| 1/8-finals | De Bakker T. | Sekiguchi S. | 1:1 RET. (6:1, 1:6, 1:3) | details | 22.06.2023 |
| 1/16-finals | Wibowo T. | Sekiguchi S. | 0:2 (0:6, 0:6) | details | 21.06.2023 |
| Japan: M25 Kashiwa - Singles - Main |
|---|
| 1/8-finals | Lee J. M. | Sekiguchi S. | WO. | details | 06.04.2023 |
| 1/16-finals | Sekiguchi S. | Ito T. | 2:1 (4:6, 6:3, 7:5) | details | 05.04.2023 |
 India: M25 Lucknow - Singles - Main |
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| 1/16-finals | Sekiguchi S. | Singh K. | 0:2 (3:6, 4:6) | details | 22.03.2023 |
| India: M25 New Delhi - Singles - Main |
|---|
| 1/8-finals | Jang Y. | Sekiguchi S. | 2:1 (2:6, 7:5, 6:3) | details | 16.03.2023 |
| 1/16-finals | Shin W. | Sekiguchi S. | 1:2 (7:5, 5:7, 3:6) | details | 15.03.2023 |
| Kazakhstan: M15 Aktobe - Singles - Main |
|---|
| 1/8-finals | Bertuccioli F. | Sekiguchi S. | 1:1 AWA. (7:64, 4:6, 4:4) | details | 02.03.2023 |
| 1/16-finals | Oetzbach A. | Sekiguchi S. | 0:2 (3:6, 4:6) | details | 01.03.2023 |
| Australia: M25 Burnie - Singles - Main |
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| 1/8-finals | Walton A. | Sekiguchi S. | 2:1 (6:1, 63:7, 7:63) | details | 09.02.2023 |