Stadium: Court 2 Round: 64 Ground: Hardcourt outdoor
| Challenger Chengdu | 2019/08/02 09:15 | Shuichi Sekiguchi v Tatsuma Ito | 2-6,1-6 |
| Challenger Kyoto | 2017/02/21 01:30 | Tatsuma Ito v Shuichi Sekiguchi | 6-2,6-3 |
| Challenger Nanchang | 2016/09/12 02:00 | Tatsuma Ito v Shuichi Sekiguchi | 6-3,1-6,7-6 |
| ITF M15 Te Anau | 2020/01/04 00:30 | Luke Saville v Shuichi Sekiguchi | 6-3,6-3 |
| ITF M15 Te Anau | 2020/01/02 21:00 | George Stoupe v Shuichi Sekiguchi | 3-6,1-6 |
| ITF M15 Te Anau | 2020/01/01 22:00 | Calum Puttergill v Shuichi Sekiguchi | 6-2,2-6,2-6 |
| ITF M15 Te Anau | 2019/12/31 05:15 | Sam Ryan Ziegann v Shuichi Sekiguchi | 2-6,3-6 |
| Challenger Pune | 2019/11/14 06:30 | Shuichi Sekiguchi v Roberto Ortega-Olmedo | 2-6,4-6 |
| Challenger Pune | 2019/11/12 07:45 | Shuichi Sekiguchi v Roman Blokhin | 6-3,6-0 |
| Challenger Kobe | 2019/11/04 02:40 | Ben Patael v Shuichi Sekiguchi | 6-3,6-2 |
| Challenger Playford 2 | 2019/10/31 02:55 | Marc Polmans v Shuichi Sekiguchi | 6-3,6-4 |
| Australian Open WC | 2019/12/08 06:00 | Jason Jung v Tatsuma Ito | 5-7,4-6 |
| Australian Open WC | 2019/12/07 05:30 | Yunseong Chung v Tatsuma Ito | 6-1,4-6,4-6 |
| Australian Open WC | 2019/12/06 03:55 | Ji Sung Nam v Tatsuma Ito | 6-3,1-6,1-6 |
| Australian Open WC | 2019/12/04 03:35 | Jumpei Yamasaki v Tatsuma Ito | 2-6,2-6 |
| Challenger Playford 2 | 2019/11/01 01:50 | Alex Bolt v Tatsuma Ito | 5-7,4-6 |
| Challenger Playford 2 | 2019/10/31 03:30 | Blake Mott v Tatsuma Ito | 4-6,6-7 |
| Challenger Playford 2 | 2019/10/30 01:20 | Brydan Klein v Tatsuma Ito | 4-6,4-6 |
| Challenger Traralgon | 2019/10/26 06:15 | Andrew Harris v Tatsuma Ito | 4-6,7-6,7-6 |