Stadium: Court 3 Round: 26 Ground: Clay
| Challenger Biella | 2021/05/17 14:50 | Dmitry Popko v Thai-Son Kwiatkowski | 2-6,6-1,6-7 |
| ITF M25 Prague | 2021/05/14 11:10 | Thai-Son Kwiatkowski v Jack Draper | 3-6,5-7 |
| ITF M25 Prague | 2021/05/13 11:50 | Thai-Son Kwiatkowski v Patrik Rikl | 4-6,7-6,6-2 |
| ITF M25 Prague | 2021/05/11 14:15 | Thai-Son Kwiatkowski v Filip Duda | 6-3,6-1 |
| Challenger Tallahassee | 2021/04/23 17:35 | Bjorn Fratangelo v Thai-Son Kwiatkowski | 7-5,6-4 |
| Challenger Tallahassee | 2021/04/22 19:30 | Thai-Son Kwiatkowski v Jason Jung | 6-3,6-2 |
| Challenger Tallahassee | 2021/04/20 16:45 | Thai-Son Kwiatkowski v Mitchell Krueger | 3-6,7-6,6-3 |
| Challenger Orlando | 2021/04/13 16:05 | Thai-Son Kwiatkowski v Altug Celikbilek | 2-6,3-6 |
| Challenger Biella | 2021/05/18 08:30 | Elliot Benchetrit v Ulises Blanch | 4-6,4-6 |
| ATP Miami | 2021/03/22 19:55 | Damir Dzumhur v Ulises Blanch | 7-6,6-4 |
| Challenger Nur-Sultan | 2021/03/01 06:15 | Ulises Blanch v Alibek Kachmazov | 2-6,6-4,3-6 |
| Challenger Nur-Sultan Qual | 2021/02/28 05:20 | Ulises Blanch v Yan Bondarevskiy | 7-6,6-3 |
| Challenger Nur-Sultan | 2021/02/24 11:10 | Martin Klizan v Ulises Blanch | 6-7,6-2,7-6 |
| Challenger Nur-Sultan | 2021/02/23 07:15 | Dmitry Popko v Ulises Blanch | 4-6,6-2,6-7 |
| Challenger Potchefstroom | 2021/02/17 10:30 | Teymuraz Gabashvili v Ulises Blanch | 6-4,1-6,6-3 |
| Challenger Potchefstroom | 2021/02/16 08:00 | Ulises Blanch v Peter Polansky | 7-6,6-3 |