Stadium: Court 1 Round: 26 Ground: Hardcourt indoor
| Challenger Oeiras | 2021/05/25 10:00 | Carlos Gimeno Valero v Vitaliy Sachko | 6-2,6-1 |
| ITF M25 Vic | 2021/05/23 09:30 | Carlos Gimeno Valero v Pedro Cachin | 1-6,6-3,6-4 |
| ITF M25 Vic | 2021/05/22 08:30 | Carlos Gimeno Valero v Camilo Ugo Carabelli | 6-3,7-5 |
| ITF M25 Vic | 2021/05/21 09:55 | Carlos Gimeno Valero v Javier Barranco Cosano | 6-2,6-1 |
| ITF M25 Vic | 2021/05/20 11:05 | Carlos Gimeno Valero v Vladyslav Orlov | 6-4,6-3 |
| ITF M25 Vic | 2021/05/19 15:00 | Carlos Gimeno Valero v Martin Cuevas | 6-3,3-6,6-2 |
| ATP Madrid | 2021/05/01 15:05 | Stefano Travaglia v Carlos Gimeno Valero | 5-7,6-1,7-5 |
| ATP Barcelona | 2021/04/18 13:00 | Carlos Gimeno Valero v Tallon Griekspoor | 7-6,6-7,3-6 |
| Challenger Oeiras | 2021/05/24 11:45 | Viktor Galovic v Duje Ajdukovic | 4-6,7-6,6-1 |
| Challenger Biella | 2021/05/17 11:00 | Viktor Galovic v Tim Van Rijthoven | 6-7,3-6 |
| Challenger Biella | 2021/05/16 12:10 | Teymuraz Gabashvili v Viktor Galovic | 1-6,4-6 |
| ITF M25 Prague | 2021/05/13 14:00 | Manuel Guinard v Viktor Galovic | 7-6,6-2 |
| ITF M25 Prague | 2021/05/11 12:50 | Viktor Galovic v Vit Kopriva | 7-5,6-3 |
| Challenger Biella | 2021/05/04 11:55 | Jay Clarke v Viktor Galovic | 7-5,6-2 |
| Challenger Biella | 2021/05/03 08:30 | Viktor Galovic v Dimitar Kuzmanov | 6-4,6-2 |
| Challenger Biella | 2021/05/02 11:00 | Tatsuma Ito v Viktor Galovic | 4-6,3-6 |