Stadium: Court 10 Round: 62 Ground: Clay
| ITF M15 Naples | 2021/10/11 13:30 | Anton Semenov v Credit Chaiyarin | 3-6,5-7 |
| ITF M15 Naples | 2021/10/04 14:00 | Anton Semenov v Hugo Cazaban | 3-6,1-6 |
| ITF M15 Antalya | 2021/06/14 09:45 | Olexiy Kolisnyk v Anton Semenov | 7-6,6-0 |
| ITF M15 Antalya | 2021/06/13 07:30 | Anton Semenov v Elbert Barr | 6-1,6-4 |
| ITF M15 Antalya | 2021/06/09 09:05 | Gonzalo Lama v Anton Semenov | 6-2,6-3 |
| ITF M15 Antalya | 2021/05/31 10:30 | Anton Semenov v Lorenzo Joaquin Rodriguez | 1-6,2-6 |
| ITF M15 Antalya | 2021/05/25 07:00 | Paul Woerner v Anton Semenov | 6-1,6-3 |
| ITF M25 Santo Domingo | 2021/12/07 13:00 | Matt Kuhar v Stefan Simeunovic | 6-3,6-1 |
| ITF M25 Santo Domingo | 2021/12/06 13:30 | Stefan Simeunovic v Juan Luis Yanine | 6-2,6-1 |
| ITF M25 Santo Domingo | 2021/12/05 14:00 | Stefan Simeunovic v Jesus M Rosario | 6-1,6-2 |
| ITF M15 Guatemala | 2021/11/25 17:10 | Stefan Simeunovic v Taha Baadi | 6-7,4-6 |
| ITF M15 Guatemala | 2021/11/24 17:20 | Joshua Peck v Stefan Simeunovic | 3-6,6-4,2-6 |
| ITF M15 Guatemala | 2021/11/22 16:00 | Anshumat Srivastava v Stefan Simeunovic | 0-6,0-6 |
| ITF M15 Guatemala | 2021/11/21 16:00 | Stefan Simeunovic v Ying-Ze Chen | 6-4,7-6 |
| ITF M15 Jerusalem | 2021/05/10 07:00 | Karlo Cubelic v Stefan Simeunovic | 6-1,6-1 |