Stadium: COURT 1 Round: 25 Ground: Hardcourt outdoor
| Davis Kupa | 2021/09/18 07:00 | Linh Giang Trinh v Hao Sheng Koay | 6-3,7-5 |
| Davis Kupa | 2021/09/17 07:00 | Abdulhamid Mubarak v Hao Sheng Koay | 7-5,2-6,4-6 |
| Davis Kupa | 2021/09/15 06:55 | Coleman Wong v Hao Sheng Koay | 6-3,6-1 |
| ITF M15 Monastir | 2021/09/05 11:00 | Hao Sheng Koay v Johannes Ingildsen | 6-3,6-7,3-10 |
| ITF M15 Monastir | 2021/08/29 10:30 | Hao Sheng Koay v Luis Diego Chavez Villalpando | 4-6,6-4,9-11 |
| Davis Kupa | 2017/07/21 05:30 | Hao Sheng Koay v Jabor Mohammed Ali Mutawa | 6-7,6-1,4-6 |
| ITF Sri Lanka F2 | 2017/06/27 03:00 | Giovani Samaha v Hao Sheng Koay | 6-3,6-2 |
| ITF Sri Lanka F1 | 2017/06/20 03:30 | Yurii Dzhavakian v Hao Sheng Koay | 6-4,6-1 |
| ITF M15 Monastir | 2022/07/07 11:05 | Keisuke Saitoh v Guy Orly Iradukunda | 1-6,0-6 |
| ITF M15 Monastir | 2022/07/06 09:35 | Keisuke Saitoh v Egor Tsarapkin | 6-2,6-2 |
| ITF M15 Monastir | 2022/06/30 09:30 | Keisuke Saitoh v Terence Atmane | 3-6,4-6 |
| ITF M15 Monastir | 2022/06/29 09:35 | Keisuke Saitoh v Chukang Wang | 6-1,6-3 |
| ITF M15 Monastir | 2022/06/23 08:00 | Xiaofei Wang v Keisuke Saitoh | 2-6,6-1,6-4 |
| ITF M15 Monastir | 2022/06/21 08:00 | Gabriele Bosio v Keisuke Saitoh | 4-6,5-7 |
| ITF M15 Monastir | 2022/06/17 08:00 | Skander Mansouri v Keisuke Saitoh | 6-3,6-1 |
| ITF M15 Monastir | 2022/06/16 09:40 | Joshua Charlton v Keisuke Saitoh | 6-4,4-6,3-6 |