Stadium: Court 3 Round: 25 Ground: Hardcourt indoor
| ITF M15 Ostrava | 2021/11/22 11:00 | Krstev, Ondrej v Bevan, Llewelyn | 6-3,5-7,10-6 |
| ITF M15 Opava | 2021/11/18 09:00 | Krstev, Ondrej v Lukas Pokorny | 7-6,4-6,4-6 |
| ITF M15 Opava | 2021/11/17 09:00 | Krstev, Ondrej v Minarik, Kristof | 6-4,7-5 |
| ITF M25 Prague | 2021/10/05 12:45 | Jakub Paul v Krstev, Ondrej | 7-5,6-4 |
| Trnava, Singles Main, M-ITF-SVK-03A | 2020/02/26 10:20 | Krstev, Ondrej v Aldin Setkic | 6-3,6-7,2-6 |
| ITF - M15 Oberhaching | 2020/02/20 13:15 | Krstev, Ondrej v Elmar Ejupovic | 6-3,2-6,3-6 |
| ITF - M15 Oberhaching | 2020/02/19 12:45 | Martinez, Mirko v Krstev, Ondrej | 6-0,6-7,4-6 |
| ITF - M15 Monastir | 2019/12/05 13:30 | Krstev, Ondrej v Robert, Quentin | 1-6,1-6 |
| ITF M15 Ostrava | 2021/11/22 09:00 | Lukas Pokorny v Mark Havlicek | 6-4,6-3 |
| ITF M15 Ostrava | 2021/11/21 09:00 | Vojtech Vlkovsky v Mark Havlicek | 4-6,6-7 |
| ITF M15 Opava | 2021/11/14 12:30 | Mark Havlicek v Ondrej Valek | 7-6,6-7,5-10 |
| ITF - M15 Antalya | 2021/10/25 07:00 | Mark Havlicek v Bulitski, Aliaksandr | 3-6,2-6 |
| ITF - M15 Antalya | 2021/10/24 07:00 | Mert Ramadan v Mark Havlicek | 5-7,5-7 |
| ITF - M15 Antalya | 2021/10/17 07:00 | Recek, Dominik v Mark Havlicek | 6-2,6-3 |
| ITF - M15 Antalya | 2021/10/12 07:00 | Federico Campana v Mark Havlicek | 6-4,6-3 |
| ITF - M15 Antalya | 2021/10/11 11:45 | Juan Estevez v Mark Havlicek | 6-7,0-6 |