Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| Challenger Kaohsiung | 2019/09/16 06:05 | Ray Ho v Sekiguchi, Shuichi | 6-7,3-6 |
| Challenger Shanghai | 2019/09/12 06:30 | Yasutaka Uchiyama v Sekiguchi, Shuichi | 6-4,6-3 |
| Challenger Shanghai | 2019/09/11 06:45 | Sekiguchi, Shuichi v Myneni, Saketh | 4-6,6-3,7-6 |
| Challenger Shanghai | 2019/09/09 06:05 | Grills, Jacob v Sekiguchi, Shuichi | 6-3,1-6,1-6 |
| Jinan, China | 2019/09/04 06:30 | Akira Santillan v Sekiguchi, Shuichi | 6-1,6-2 |
| Jinan, China | 2019/09/03 04:55 | Mukund Sasikumar v Sekiguchi, Shuichi | 3-6,3-6 |
| Challenger Yokkaichi | 2019/08/07 05:30 | Zhang, Ze v Sekiguchi, Shuichi | 6-3,6-7,5-7 |
| Challenger Yokkaichi | 2019/08/06 01:00 | Kousuke Ogura v Sekiguchi, Shuichi | 1-6,3-6 |
| Challenger Shanghai | 2019/09/14 03:00 | Gunneswaran, Prajnesh v Yasutaka Uchiyama | 6-7,4-6 |
| Challenger Shanghai | 2019/09/13 03:00 | Gunneswaran, Prajnesh v Hiroki Moriya | 6-4,6-4 |
| Challenger Shanghai | 2019/09/12 05:20 | Gunneswaran, Prajnesh v Goncalo Oliveira | 6-3,6-4 |
| Challenger Shanghai | 2019/09/10 05:50 | Gunneswaran, Prajnesh v Ward, James | 6-4,7-6 |
| Jinan, China | 2019/09/06 06:55 | Gunneswaran, Prajnesh v Soeda, Go | 6-7,6-3,3-6 |
| Jinan, China | 2019/09/05 07:05 | Gunneswaran, Prajnesh v Tung-Lin Wu | 6-4,7-6 |
| Jinan, China | 2019/09/04 06:00 | Gunneswaran, Prajnesh v Renta Tokuda | 6-2,6-2 |
| US Open, New York, USA | 2019/08/26 17:05 | Gunneswaran, Prajnesh v Daniil Medvedev | 4-6,1-6,2-6 |