Stadium: Court 6 Round: 24 Ground: Hardcourt outdoor
| ITF Japan F4 | 2018/03/27 01:00 | Jacob Grills v Shuichi Sekiguchi | 7-6,4-6,6-3 |
| Challenger Jinan | 2019/09/03 02:00 | Teymuraz Gabashvili v Jacob Grills | 6-4,5-7,6-1 |
| Challenger Baotou | 2019/08/26 02:00 | Jacob Grills v Di Wu | 6-7,4-6 |
| ATP - Los Cabos | 2019/07/29 00:00 | Dominik Koepfer v Jacob Grills | 6-3,7-6 |
| ATP - Los Cabos | 2019/07/28 01:25 | Jacob Grills v Lukas Lacko | 6-3,6-2 |
| Challenger - Granby | 2019/07/22 17:30 | Cem Ilkel v Jacob Grills | 6-1,6-0 |
| Challenger Gatineau | 2019/07/16 18:10 | Yosuke Watanuki v Jacob Grills | 6-7,6-1,6-0 |
| Challenger - Winnipeg | 2019/07/10 15:00 | Jacob Grills v Shintaro Imai | 7-6,6-7,0-6 |
| Challenger - Parma | 2019/06/20 08:00 | Jacob Grills v Jacopo Berrettini | 1-6,4-6 |
| Challenger Jinan | 2019/09/04 06:30 | Akira Santillan v Shuichi Sekiguchi | 6-1,6-2 |
| Challenger Jinan | 2019/09/03 04:55 | Mukund Sasikumar v Shuichi Sekiguchi | 3-6,3-6 |
| Challenger Yokkaichi | 2019/08/07 05:30 | Ze Zhang v Shuichi Sekiguchi | 6-3,6-7,5-7 |
| Challenger Yokkaichi | 2019/08/06 01:00 | Kousuke Ogura v Shuichi Sekiguchi | 1-6,3-6 |
| Challenger Chengdu | 2019/08/02 09:15 | Shuichi Sekiguchi v Tatsuma Ito | 2-6,1-6 |
| Challenger Chengdu | 2019/08/01 07:45 | Goncalo Oliveira v Shuichi Sekiguchi | 4-6,6-3,4-6 |
| Challenger Chengdu | 2019/07/31 08:55 | Shuichi Sekiguchi v Tsung-Hua Yang | 6-4,6-4 |
| Challenger Chengdu | 2019/07/29 10:30 | Weiqiang Zheng v Shuichi Sekiguchi | 5-7,1-6 |