Stadium: Dusit Center Round: 27 Ground: Hardcourt outdoor
| Challenger Puerto Vallarta | 2021/11/27 02:00 | Alejandro Tabilo v Tatsuma Ito | 6-2,6-2 |
| Challenger Puerto Vallarta | 2021/11/25 00:30 | Alex Hernandez v Tatsuma Ito | 2-6,3-6 |
| Challenger Puerto Vallarta | 2021/11/22 22:30 | Gijs Brouwer v Tatsuma Ito | 2-6,6-7 |
| Challenger Champaign | 2021/11/15 19:00 | Tatsuma Ito v Jeffrey John Wolf | 3-6,6-3,3-6 |
| Challenger Knoxville | 2021/11/09 19:40 | Tatsuma Ito v Mitchell Krueger | 6-7,3-6 |
| Challenger Charlottesville | 2021/11/01 18:35 | Tatsuma Ito v Go Soeda | 6-7,5-7 |
| Challenger Las Vegas | 2021/10/28 18:00 | Tatsuma Ito v Taro Daniel | 2-6,1-6 |
| Challenger Las Vegas | 2021/10/26 22:05 | Donald Young v Tatsuma Ito | 4-6,4-6 |
| ITF M25 Pretoria | 2021/09/29 13:05 | Takuto Niki v Dylan Salton | 2-6,6-7 |
| ITF M25 Johannesburg | 2021/09/21 10:15 | Takuto Niki v Mateus Alves | 3-6,4-6 |
| ITF M25 Johannesburg | 2021/09/15 08:00 | Takuto Niki v Jeremy Beale | 0-6,4-6 |
| ITF M15 Monastir | 2021/09/09 08:00 | Takuto Niki v Masamichi Imamura | 2-6,3-6 |
| ITF M15 Monastir | 2021/09/08 08:00 | Takuto Niki v Lucca Pinto | 6-2,6-2 |
| ITF M15 Monastir | 2021/09/01 09:30 | Takuto Niki v Guy Orly Iradukunda | 6-2,2-6,3-6 |
| ITF M15 Castelo Branco | 2021/07/28 17:20 | Takuto Niki v Luca Giacomini | 4-6,5-7 |
| ITF M25 Idanha-A-Nova | 2021/07/21 12:05 | Takuto Niki v Nicolas Moreno De Alboran | 3-6,2-6 |