Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| Challenger Kaohsiung | 2019/09/16 06:05 | Ray Ho v Shuichi Sekiguchi | 6-7,3-6 |
| Challenger Shanghai | 2019/09/12 06:30 | Yasutaka Uchiyama v Shuichi Sekiguchi | 6-4,6-3 |
| Challenger Shanghai | 2019/09/11 06:45 | Shuichi Sekiguchi v Saketh Myneni | 4-6,6-3,7-6 |
| Challenger Shanghai | 2019/09/09 06:05 | Jacob Grills v Shuichi Sekiguchi | 6-3,1-6,1-6 |
| 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 Shanghai | 2019/09/14 03:00 | Prajnesh Gunneswaran v Yasutaka Uchiyama | 6-7,4-6 |
| Challenger Shanghai | 2019/09/13 03:00 | Prajnesh Gunneswaran v Hiroki Moriya | 6-4,6-4 |
| Challenger Shanghai | 2019/09/12 05:20 | Prajnesh Gunneswaran v Goncalo Oliveira | 6-3,6-4 |
| Challenger Shanghai | 2019/09/10 05:50 | Prajnesh Gunneswaran v James Ward | 6-4,7-6 |
| Challenger Jinan | 2019/09/06 06:55 | Prajnesh Gunneswaran v Go Soeda | 6-7,6-3,3-6 |
| Challenger Jinan | 2019/09/05 07:05 | Prajnesh Gunneswaran v Tung-Lin Wu | 6-4,7-6 |
| Challenger Jinan | 2019/09/04 06:00 | Prajnesh Gunneswaran v Renta Tokuda | 6-2,6-2 |
| US Open | 2019/08/26 17:05 | Prajnesh Gunneswaran v Daniil Medvedev | 4-6,1-6,2-6 |