Stadium: Court 7 Round: 25 Ground: Hardcourt outdoor
| Challenger Oeiras | 2021/05/24 10:00 | Lucas Catarina v Nikolas Sanchez Izquierdo | 4-6,2-6 |
| Challenger Oeiras | 2021/05/23 10:00 | Lucas Catarina v Ronald Slobodchikov | 6-1,6-3 |
| ITF M15 Monastir | 2021/05/09 08:30 | Luca Potenza v Lucas Catarina | 1-6,6-2,6-1 |
| ITF M15 Monastir | 2021/05/08 08:30 | Lucas Catarina v Alexander Donski | 7-6,1-6,6-4 |
| ITF M15 Monastir | 2021/05/07 08:30 | Alibek Kachmazov v Lucas Catarina | 6-7,2-6 |
| ITF M15 Monastir | 2021/05/06 08:30 | Zachary Svajda v Lucas Catarina | 4-6,3-6 |
| ITF M15 Monastir | 2021/05/05 08:30 | Giorgio Ricca v Lucas Catarina | 2-6,6-3,3-6 |
| ITF M15 Monastir | 2021/05/02 08:30 | Benjamin Pietri v Lucas Catarina | 0-6,0-6 |
| ITF M15 Kouvola | 2021/05/26 08:00 | Vladimir Ivanov v Lorenzo Rottoli | 2-6,4-6 |
| ITF M15 Antalya | 2021/05/19 11:10 | Vladimir Ivanov v Edoardo Eremin | 3-6,4-6 |
| ITF M15 Antalya | 2021/05/13 11:40 | Alexander Erler v Vladimir Ivanov | 5-7,6-3,6-1 |
| ITF M15 Antalya | 2021/05/12 11:30 | Vladimir Ivanov v Adrian Mateo Bejenaru | 6-3,7-6 |
| ITF M15 Antalya | 2021/05/11 07:00 | Vladimir Ivanov v Alafia Ayeni | 7-6,7-5 |
| ITF M15 Antalya | 2021/05/10 07:00 | Vladimir Ivanov v Mark Tryakshin | 0-6,6-4,10-4 |
| ITF M15 Antalya | 2021/05/09 07:00 | Vladimir Ivanov v Daniel Svensson | 7-5,1-6,10-2 |
| ITF M15 St Petersburg | 2021/04/14 10:40 | Vladimir Ivanov v Constantin Bittoun Kouzmine | 1-6,7-6,2-6 |