Stadium: Dusit Center Round: 28 Ground: Hardcourt outdoor
| Challenger Maia MD | 2021/12/16 17:00 | Borges/Cabral v Matsui/Uesugi | 6-2,6-1 |
| Challenger Maia MD | 2021/12/15 15:20 | Matsui/Uesugi v Bortolotti/Gornes | 1-6,6-3,10-7 |
| Challenger Antalya MD | 2021/12/09 11:40 | Matsui/Uesugi v Lomakin/Prihodko | 6-3,1-6,8-10 |
| ITF M15 Antalya MD | 2021/12/04 09:45 | Lomakin/Prihodko v Matsui/Uesugi | 7-5,3-6,10-5 |
| ITF M15 Antalya MD | 2021/12/03 09:25 | Matsui/Uesugi v Malgaroli/Parizzia | 6-4,6-4 |
| ITF M15 Antalya MD | 2021/11/30 11:30 | Ilkel/Ozdemir v Matsui/Uesugi | 6-4,1-6,10-12 |
| Challenger Bari MD | 2021/11/24 10:00 | Glasspool/Heliovaara v Matsui/Uesugi | 7-5,6-2 |
| Challenger Helsinki MD | 2021/11/16 11:30 | Matsui/Uesugi v Vasa/Vasa | 4-6,4-6 |