Daniil Ostapenkov
2021
| J1 VRSAR | [9] | Semi |
| J2 SHYMKENT | [1] | Semi |
| J2 NOVISAD | [7] | 1R |
| J1 PANCEVO | Final | |
| J2 BUDAPEST | 2R | |
| JAMILAN-2 | 1R | |
| J2 PILSEN | Quarter | |
| J2 RYAZAN | Semi | |
| J3 ALMETIEVSK | [8] | 1R |
| J1 SVYATOPETRIVSKEVILLAGE | 2R |
2020
| J5 CHORNOMORSK-2 | [2] | Win |
| J4 ALMATY | [6] | 2R |
2019
| J5 MINSK-2 | [7] | Win |
| J5 MINSK | [8] | Semi |
| J5 LIEPAJA | 2R | |
| J5 SIAULIAI | Final | |
| J4 RIGA | 2R | |
| J5 TELAVI | Semi |
World Ranking
ATP Ranking　732th
Year-end Junior World Ranking
- Year-end 2021 48th
- Year-end 2020 440th
- Year-end 2019 648th
Rival
artur kukasian (2-0)
ilia simakin (2-0)
egor shestakov (2-0)
tauras mickus (2-0)
Match Details
J1 VRSAR
| W | 2R | Marcel Kamrowski | 6-2 6-0 |
| W | 3R | Isac Stroemberg | 1-6 6-3 6-3 |
| W | QF | Vilius Gaubas | 1-6 6-4 6-4 |
| L | SF | Kilian Feldbausch | 1-6 0-6 |
J2 SHYMKENT
| W | 1R | Oleg Syrovatskiy | 6-4 6-0 |
| W | 2R | Kolganov Kirill | 6-2 6-4 |
| W | QF | Amir Milushev | 6-3 6-4 |
| L | SF | Amirkhamza Nasridinov | 4-6 2-4 |
J2 NOVISAD
| L | 1R | Nikola Jovanovic | 0-6 3-6 |
J1 PANCEVO
| W | 1R | Stefan Popovic | 1-6 6-2 6-1 |
| W | 2R | Gerard Campana Lee | 3-6 6-0 6-1 |
| W | QF | Artur Kukasian | 6-1 6-0 |
| W | SF | Aleksa Pisaric | 3-6 6-1 6-3 |
| L | F | Olaf Pieczkowski | 5-7 1-6 |
J2 BUDAPEST
| W | 1R | Alessio Basile | 4-6 7-5 6-4 |
| L | 2R | Matthias Ujvary | 6-7 3-6 |
JAMILAN-2
| L | 1R | Giorgio Tabacco | 6-7 2-6 |
J2 PILSEN
| W | 1R | Noa Vukadin | 7-6 4-6 7-6 |
| W | 2R | Alexander Blockx | 1-6 7-6 6-4 |
| L | QF | Bor Artnak | 1-6 6-4 5-7 |
J2 RYAZAN
| W | 1R | Venedikt Tsirikidze | 6-4 6-2 |
| W | 2R | Artur Kukasian | 6-3 6-4 |
| W | QF | Ilia Simakin | 7-6 6-4 |
| L | SF | Konstantin Zhzhenov | 2-6 3-6 |
J3 ALMETIEVSK
| L | 1R | Grigory Shebekin | 3-6 6-7 |
J1 SVYATOPETRIVSKEVILLAGE
| W | 1R | Sascha Gueymard Wayenburg | 6-3 4-6 6-3 |
| L | 2R | Constantinos Koshis | 4-6 4-6 |
J5 CHORNOMORSK-2
| W | 1R | Maksym Neverov | 6-2 6-1 |
| W | 2R | Vadym Rogynskyi | 6-2 6-4 |
| W | QF | Mikhail Dubrouski | 6-1 6-4 |
| W | SF | Nazar Fedoryshyn | 6-2 6-2 |
| W | F | German Samofalov | 6-4 3-6 6-4 |
J4 ALMATY
| W | 1R | Shingis Bayseit | 6-2 6-2 |
| L | 2R | Mikalai Bankou | 4-6 6-3 2-6 |
J5 MINSK-2
| W | 1R | Egor Shestakov | 7-6 1-6 6-4 |
| W | 2R | Ivan Kremenchutskyi | 6-2 6-1 |
| W | QF | Danila Ishchanka | 6-3 6-2 |
| W | SF | Ainius Sabaliauskas | 7-6 7-5 |
| W | F | Ilia Simakin | 4-6 7-6 6-0 |
J5 MINSK
| W | 1R | Daniil Romanov | 7-6 6-0 |
| W | 2R | Taras Ignatiuk | 6-1 6-4 |
| W | QF | Elisey Kalashnikov | 6-1 6-3 |
| L | SF | Artem Podorozhnyi | 4-6 6-7 |
J5 LIEPAJA
| W | 1R | Tauras Mickus | 6-3 6-3 |
| L | 2R | Maxim Dontsov | 2-6 3-6 |
J5 SIAULIAI
| W | 1R | Tauras Mickus | 6-2 6-2 |
| W | 2R | Egor Shestakov | 7-5 4-6 6-3 |
| W | QF | Daniils Snaiders | 6-0 6-0 |
| W | SF | Petr Bar Biryukov | 7-5 6-7 7-6 |
| L | F | Edvards Teodors Liepins | 1-6 2-6 |
J4 RIGA
| W | 1R | Markuss Tions | 6-3 7-6 |
| L | 2R | Mika Lipp | 3-6 1-6 |
J5 TELAVI
| W | 1R | Luca Giordano | 6-4 6-2 |
| W | 2R | Danil Ozernoy | 6-1 7-5 |
| W | QF | Mikhail Malakhovich | 6-4 6-4 |
| L | SF | Saba Purtseladze | 6-3 3-6 4-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 14379, Number of registered players: 7,503, Number of registered results: 447,330