Stadium: Court 1 Round: 24 Ground: Hardcourt outdoor
| Challenger Seoul Qual | 2017/05/07 04:20 | Makoto Ochi v Shuichi Sekiguchi | 1-6,1-6 |
| ITF M25 Hong Kong | 2019/06/06 02:00 | Shuichi Sekiguchi v Xin Gao | 6-3,6-1 |
| ITF M25 Hong Kong | 2019/06/04 05:25 | Shuichi Sekiguchi v Wai Yu Kai | 6-2,6-1 |
| ITF M25 Nonthaburi | 2019/05/31 04:40 | Rio Noguchi v Shuichi Sekiguchi | 7-5,5-7,6-1 |
| ITF M25 Nonthaburi | 2019/05/30 10:10 | Chayanon Kaewsuto v Shuichi Sekiguchi | 2-6,7-5,4-6 |
| ITF M25 Nonthaburi | 2019/05/29 06:35 | Adil Kalyanpur v Shuichi Sekiguchi | 6-7,4-6 |
| ITF M25 Nonthaburi | 2019/05/26 03:00 | Ji Sung Nam v Shuichi Sekiguchi | 1-6,4-6 |
| ITF M25 Nonthaburi | 2019/05/25 05:15 | Harry Bourchier v Shuichi Sekiguchi | 4-6,4-6 |
| ITF M25 Nonthaburi | 2019/05/24 04:45 | Shuichi Sekiguchi v Kelsey Stevenson | 7-6,6-2 |
| Challenger Little Rock | 2019/06/04 15:00 | Orlando Luz v Makoto Ochi | 6-4,5-7,7-6 |
| Challenger Jerusalem | 2019/05/20 09:15 | Makoto Ochi v Evan King | 6-3,3-6,1-6 |
| Challenger Gwangju | 2019/05/15 02:00 | Makoto Ochi v Evgeny Donskoy | 3-6,4-6 |
| Challenger Gwangju | 2019/05/14 02:00 | Cheng-Peng Hsieh v Makoto Ochi | 6-4,5-7,3-6 |
| Challenger Busan | 2019/05/07 06:20 | Makoto Ochi v Duckhee Lee | 6-7,4-6 |
| Challenger Busan | 2019/05/06 02:00 | Makoto Ochi v Young Seok Lee | 6-3,6-4 |
| Challenger Nanchang | 2019/04/23 10:00 | Makoto Ochi v Enrique Lopez-Perez | 3-6,0-6 |
| Challenger Nanchang | 2019/04/22 04:55 | Tung-Lin Wu v Makoto Ochi | 3-6,2-6 |