Stadium: Court 1 Round: 14 Ground: Clay
| Challenger Marbella | 2021/04/01 10:00 | Taro Daniel v Carlos Gomez-Herrera | 7-5,6-4 |
| Challenger Marbella | 2021/03/30 10:20 | Carlos Gomez-Herrera v Carlos Gimeno Valero | 7-6,7-6 |
| Challenger Santiago | 2021/03/15 13:00 | Carlos Gomez-Herrera v Gonzalo Villanueva | 4-6,3-6 |
| Challenger Santiago | 2021/03/14 14:00 | Carlos Gomez-Herrera v Victor Nunez | 6-4,6-2 |
| ATP Santiago | 2021/03/06 18:45 | Carlos Gomez-Herrera v Renzo Olivo | 6-2,4-6,4-6 |
| ATP Buenos Aires | 2021/02/27 13:00 | Carlos Gomez-Herrera v Sumit Nagal | 6-7,6-2,6-7 |
| ATP Cordoba | 2021/02/21 18:15 | Joao Menezes v Carlos Gomez-Herrera | 6-1,6-1 |
| ATP Cordoba | 2021/02/20 22:55 | Carlos Gomez-Herrera v Guido Andreozzi | 6-3,7-5 |
| Challenger Marbella | 2021/04/02 12:00 | Martin Klizan v Alessandro Giannessi | 0-6,3-6 |
| Challenger Marbella | 2021/03/31 13:15 | Henri Laaksonen v Martin Klizan | 3-6,3-6 |
| Challenger Marbella | 2021/03/29 13:50 | Maxime Cressy v Martin Klizan | 1-6,6-7 |
| Challenger Biella | 2021/03/09 10:15 | Martin Klizan v Matthias Bachinger | 1-6,1-6 |
| Challenger Nur-Sultan | 2021/03/03 04:00 | Tung-Lin Wu v Martin Klizan | 6-3,4-6,7-6 |
| Challenger Nur-Sultan | 2021/02/26 07:40 | Martin Klizan v Prajnesh Gunneswaran | 3-6,6-4,4-6 |
| Challenger Nur-Sultan | 2021/02/24 11:10 | Martin Klizan v Ulises Blanch | 6-7,6-2,7-6 |
| Challenger Nur-Sultan | 2021/02/22 09:30 | Martin Klizan v Timofey Skatov | 6-4,4-6,7-6 |