Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| Challenger Chengdu | 2019/07/31 02:00 | Thomas Fancutt v Zihao Xia | 7-6,6-4 |
| ITF M25 Kunshan | 2019/07/03 01:30 | Yuanfeng Li v Zihao Xia | 2-6,6-2,6-3 |
| ITF M25 Hengyang | 2019/06/19 06:55 | Zihao Xia v Yu Hsiang Chiu | 6-0,6-2 |
| ITF M25 Luzhou | 2019/06/01 03:05 | Zihao Xia v Yecong He | 6-7,1-6 |
| ITF M25 Luzhou | 2019/05/31 02:00 | Zihao Xia v Weiqiang Zheng | 6-7,6-2,6-4 |
| ITF M25 Luzhou | 2019/05/30 03:50 | Zihao Xia v Yuanfeng Li | 6-4,6-4 |
| ITF M25 Luzhou | 2019/05/28 07:45 | Zihao Xia v Rui-Xuan Wang | 6-2,6-2 |
| Challenger Gwangju | 2019/05/14 02:00 | Zihao Xia v Filip Peliwo | 4-6,4-6 |
| ITF M15 Jakarta | 2019/08/06 02:30 | Takashi Saito v Pak Long Yeung | 7-6,7-6 |
| ITF M15 Jakarta | 2019/08/05 03:00 | Takashi Saito v Prithvi Sekhar | 6-0,6-2 |
| ITF M25 Nonthaburi | 2019/07/31 02:30 | Rio Noguchi v Takashi Saito | 6-2,7-6 |
| ITF M25 Nonthaburi | 2019/07/30 02:30 | Takashi Saito v Worarin Kumthonkittikul | 6-2,6-4 |
| ITF M25 Nonthaburi | 2019/07/29 02:30 | Takashi Saito v Pawin Jirapoomdaje | 6-2,6-1 |
| ITF M25 Martos | 2019/06/18 14:30 | Mauricio Echazu v Takashi Saito | 7-6,4-6,2-6 |
| ITF M15 Tabarka | 2019/06/04 09:00 | Takashi Saito v Toby Martin | 1-6,1-6 |
| ITF M15 Tabarka | 2019/05/29 11:30 | Louis Tessa v Takashi Saito | 6-0,6-4 |