Stadium: Pista 2 Round: 14 Ground: Hardcourt outdoor
| Challenger Pozoblanco | 2021/07/19 16:50 | Mathias Bourgue v Martos Gornes, Sergio | 6-2,6-1 |
| Challenger Amersfoort | 2021/07/11 10:00 | Martos Gornes, Sergio v Carlos Sanchez Jover | 4-6,4-6 |
| UTR Pro Tennis Series Barcelona | 2021/06/12 08:30 | Martos Gornes, Sergio v Diego F Flores | 3-6,4-5 |
| UTR Pro Tennis Series Barcelona | 2021/06/11 13:00 | Martos Gornes, Sergio v Dominik Palan | 4-6,2-6 |
| Challenger - Oeiras | 2021/03/28 10:00 | Martos Gornes, Sergio v Denis Yevseyev | 3-6,3-6 |
| Challenger Guayaquil | 2020/11/14 15:00 | Nicolas Alvarez v Martos Gornes, Sergio | 6-0,6-2 |
| Murcia, Singles Qualifying M-ITF-ESP-05A | 2020/03/02 13:00 | Trapeznikov, Zakhar v Martos Gornes, Sergio | 6-4,0-6,10-5 |
| Challenger Sibiu | 2019/09/18 09:55 | Laurent Lokoli v Martos Gornes, Sergio | 6-1,6-2 |
| Challenger - Prague | 2021/08/24 10:15 | Haerteis, Johannes v Alex Rybakov | 4-6,2-6 |
| Luedenscheid, Germany | 2021/08/15 09:30 | Bogdan Bobrov v Haerteis, Johannes | 1-6,6-4,6-3 |
| Challenger Meerbusch | 2021/08/08 16:05 | Nedelko, Ivan v Haerteis, Johannes | 7-6,6-3 |
| Segovia, Spain | 2021/07/27 13:05 | Altug Celikbilek v Haerteis, Johannes | 6-3,6-4 |
| Challenger Pozoblanco | 2021/07/20 20:10 | Cem Ilkel v Haerteis, Johannes | 6-2,7-6 |
| Challenger Amersfoort | 2021/07/13 08:30 | Moraing, Mats v Haerteis, Johannes | 6-1,6-0 |
| Braunchsweig, Germany | 2021/07/04 11:55 | Haerteis, Johannes v Ehrenschneider, Nino | 6-3,3-6,4-6 |
| Prostejov, Czech Republic | 2021/06/15 08:30 | Haerteis, Johannes v Federico Coria | 1-6,0-6 |