Stadium: Court 17 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Daegu | 2019/06/08 04:30 | Oh, Seong-Gook v Hong, Seong Chan | 1-6,2-6 |
| ITF M15 Daegu | 2019/06/08 01:00 | Oh, Seong-Gook v Kim, Young Seok | 6-2,6-2 |
| ITF M15 Daegu | 2019/06/06 03:40 | Oh, Seong-Gook v Yeongseok Jeong | 6-1,6-2 |
| ITF M15 Daegu | 2019/06/05 04:50 | Oh, Seong-Gook v Park, Sung Jun | 6-4,6-7,7-5 |
| ITF Vietnam F5 | 2018/11/01 04:30 | Bergevi, Filip v Oh, Seong-Gook | 6-7,6-2,6-2 |
| ITF Vietnam F5 | 2018/10/31 03:00 | Oh, Seong-Gook v Grigoriy Lomakin | 6-3,2-6,6-4 |
| ITF Vietnam F4 | 2018/10/23 03:40 | Rio Noguchi v Oh, Seong-Gook | 6-3,6-2 |
| ITF Korea F6 | 2018/09/01 04:00 | Oh, Seong-Gook v Song, Min-Kyu | 1-6,6-7 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/11 02:50 | Seita Watanabe v Lim, Hyung-Chan | 6-4,6-0 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/10 02:00 | Seita Watanabe v Han, Jin Sung | 6-1,6-2 |
| ITF M15 Daegu | 2019/06/06 02:00 | Na, Jung-Woong v Seita Watanabe | 6-3,6-2 |
| ITF M15 Daegu | 2019/06/05 03:55 | Seita Watanabe v Issei Okamura | 6-4,7-6 |
| ITF M15 Daegu | 2019/06/04 02:20 | Seita Watanabe v Shin, Seung-Hun | 6-0,6-1 |
| ITF M15 Daegu | 2019/06/03 05:00 | Seita Watanabe v Lee, Dae-Hee | 6-2,6-0 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/05/16 10:30 | Manuel Guinard v Seita Watanabe | 6-3,6-1 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/05/15 08:00 | Seita Watanabe v Blokhin, Roman | 6-1,6-0 |