Oskar Grzegorzewski
2023
| J200 CAIRO-3 | [6] | 1R |
| J200 CAIRO-2 | [3] | Quarter |
| J300 BYTOM | [14] | 2R |
| J200 CASTRICUM | [15] | Semi |
| J200 PILSEN | 1R | |
| J100 SOBOTA | [4] | Semi |
| J300 CHARLEROI-MARCINELLE | 3R | |
| J100 LOUSADA | [3] | 2R |
| J200 ALDERSHOT | 1R | |
| J200 PIESTANY | 2R | |
| J200 FLORENCE | 1R | |
| J300 SARAWAK | 3R | |
| J300 NONTHABURI | 1R | |
| J200 SIAULIAI | 1R | |
| J200 OBERHACHING | 1R | |
| J100 DUBAI | [1] | 2R |
| J200 BRATISLAVA | 2R |
2022
| J3 TASHKENT-3 | [5] | 3R |
| J2 TASHKENT | 1R | |
| J2 ISTANBUL | 2R | |
| J4 DAMOUR-2 | [1] | Win |
| J4 DAMOUR | [1] | Win |
| J4 RIGA | [3] | Semi |
| J3 KRAKOW | [8] | Quarter |
| J1 BYTOM | 1R | |
| J3 POZNAN | 1R | |
| J4 EINDHOVEN | [8] | Final |
| J5 SIAULIAI | [1] | Final |
| J3 TIMISOARA | 2R | |
| J4 AARHUS | [2] | 3R |
| J4 BISTRITA | [4] | 1R |
| J4 LARNACA-2 | [3] | 1R |
| J4 BUDAPEST | [6] | 1R |
| J3 AIZKRAUKLE | 1R | |
| J4 AIZKRAUKLE | [5] | 1R |
| J3 ISTANBUL | 2R | |
| J3 HAMBURG | 2R | |
| J4 HAMBURG | [13] | 2R |
| J4 OSLO | Semi | |
| J4 FREDERIKSBERG | Quarter | |
| J5 WARSAW | [5] | 1R |
| J4 SIROKIBRIJEG-2 | 2R | |
| J4 SIROKIBRIJEG | [7] | Quarter |
2021
Nation
POL
World Ranking
ATP Ranking　1321th
Year-end Junior World Ranking
- Year-end 2023 168th
- Year-end 2022 280th
- Year-end 2021 815th
Match Details
2023 J200 CAIRO-3
| L | 1R | Alaa Trifi | 6-4 4-6 6-7 |
2023 J200 CAIRO-2
| W | 1R | Oskari Paldanius | 7-5 6-2 |
| W | 2R | Ahmed Elkarmoty | 5-1 |
| L | QF | Andreas Timini | 5-7 3-6 |
2023 J300 BYTOM
| L | 2R | Andres Santamarta Roig | 6-4 0-6 3-6 |
2023 J200 CASTRICUM
| W | 2R | Marek Nano | 6-4 6-4 |
| W | 3R | Daniil Sarksian | 6-4 6-4 |
| W | QF | Pieter De Lange | 7-5 6-4 |
| L | SF | Theo Papamalamis | 4-6 2-6 |
2023 J200 PILSEN
| L | 1R | Giacomo Nosei | 2-6 0-6 |
2023 J100 SOBOTA
| W | 1R | Boris Durovic | 6-2 7-5 |
| W | 2R | Kostiantyn Mantach | 6-3 7-5 |
| W | QF | Thomas Nicholas Gadecki | 6-1 6-4 |
| L | SF | Jan Klimas | 3-6 4-6 |
2023 J300 CHARLEROI-MARCINELLE
| W | 1R | Ethan Dasset | 6-1 6-1 |
| W | 2R | Pedro Rodrigues | 3-6 6-2 6-4 |
| L | 3R | Pavle Marinkov | 5-7 4-6 |
2023 J100 LOUSADA
| L | 2R | Mika Petkovic | 4-6 6-4 1-6 |
2023 J200 ALDERSHOT
| L | 1R | Viktor Frydrych | 6-2 3-6 1-6 |
2023 J200 PIESTANY
| W | 1R | Andreas Timini | 7-5 6-2 |
| L | 2R | Yannik Kelm | 3-6 6-7 |
2023 J200 FLORENCE
| L | 1R | Matteo Sciahbasi | 6-7 6-2 2-6 |
2023 J300 SARAWAK
| W | 1R | Wenbo Bai | 6-1 6-4 |
| W | 2R | Jeremy Zhang | 6-0 6-4 |
| L | 3R | Aryan Shah | 5-7 5-7 |
2023 J300 NONTHABURI
| L | 1R | Zachary Viiala | 2-6 2-6 |
2023 J200 SIAULIAI
| L | 1R | Filippo Romano | 3-6 3-6 |
2023 J200 OBERHACHING
| L | 1R | Sydney Zick | 4-6 7-6 6-7 |
2023 J100 DUBAI
| W | 1R | Aditya Govila | 1-6 6-4 6-1 |
| L | 2R | Nikola Djosic | 2-6 |
2023 J200 BRATISLAVA
| W | 1R | Trisztan Gubi | 6-0 6-3 |
| L | 2R | Jan Kumstat | 4-6 4-6 |
2022 J3 TASHKENT-3
| W | 2R | Maxim Goncharov | 7-6 3-6 6-1 |
| L | 3R | Ivan Iutkin | 3-6 6-4 3-6 |
2022 J2 TASHKENT
| L | 1R | Amir Milushev | 6-4 1-6 3-6 |
2022 J2 ISTANBUL
| W | 1R | Albert Saar | 6-0 4-6 7-5 |
| L | 2R | Michal Krajci | 6-7 5-7 |
2022 J4 DAMOUR-2
| W | 1R | Mustapha El Natour | 6-1 6-2 |
| W | 2R | Ahmed Hassairi | 6-2 6-2 |
| W | QF | Mostafa Elbasnaly | 6-0 2-1 |
| W | SF | Aly El Rafie | 6-4 6-3 |
| W | F | Bruno Kokot | 1-6 6-2 6-2 |
2022 J4 DAMOUR
| W | 1R | Omar Farahat | 6-1 6-0 |
| W | 2R | Ahmed Abdelaziz | 6-2 4-6 6-0 |
| W | QF | Mostafa Elbasnaly | 6-1 6-0 |
| W | SF | Aly El Rafie | 3-6 6-2 6-2 |
| W | F | Bruno Kokot | 6-3 7-6 |
2022 J4 RIGA
| W | 1R | Artem Lyapshin | 6-3 3-6 6-3 |
| W | 2R | Julius Aleksandrovas | 6-2 6-2 |
| W | QF | Luke Hooper | 6-2 6-1 |
| L | SF | Nicolai Budkov Kjaer | 2-6 2-6 |
2022 J3 KRAKOW
| W | 1R | Karel Froemel | 6-4 6-2 |
| W | 2R | Vitalii Hnidets | 6-0 7-6 |
| L | QF | Tomasz Berkieta | 7-6 4-6 2-6 |
2022 J1 BYTOM
| L | 1R | Ye Hongyu | 1-6 1-6 |
2022 J3 POZNAN
| L | 1R | Erik Tkalenko | 7-6 6-7 0-3 |
2022 J4 EINDHOVEN
| W | 2R | Daan Meijer | 6-2 6-3 |
| W | 3R | Thiago Guglieri | 6-4 6-2 |
| W | QF | Luka Novakovic | 6-4 6-3 |
| W | SF | Pepijn Bastiaansen | 6-3 2-6 6-3 |
| L | F | Gustavo Ribeiro De Almeida | 3-6 5-7 |
2022 J5 SIAULIAI
| W | 1R | Pijus Reklevicius | 6-0 6-4 |
| W | 2R | Sviatoslav Koliadynskyi | 6-1 6-1 |
| W | QF | Stefans Audrins | 6-0 6-2 |
| W | SF | Simon Munkhammar | 6-1 6-4 |
| L | F | Aleksei Mokrov | 6-2 0-6 5-7 |
2022 J3 TIMISOARA
| W | 1R | Matteo Covato | 6-1 2-6 6-4 |
| L | 2R | Vuk Radjenovic | 4-6 5-7 |
2022 J4 AARHUS
| W | 2R | Bjorn Cristiano Asbjornrod Valdivieso | 6-2 6-4 |
| L | 3R | Mika Bunjes | 4-6 7-6 1-6 |
2022 J4 BISTRITA
| L | 1R | Dario Alexandru Ciobotaru | 1-6 3-6 |
2022 J4 LARNACA-2
| L | 1R | Andreas Timini | 3-6 6-7 |
2022 J4 BUDAPEST
| L | 1R | Denis Petak | 7-6 3-6 2-6 |
2022 J3 AIZKRAUKLE
| L | 1R | Saba George Nanobashvili | 4-6 4-6 |
2022 J4 AIZKRAUKLE
| L | 1R | Petr Panacek | 2-6 4-6 |
2022 J3 ISTANBUL
| W | 1R | Glib Sekachov | 7-5 4-6 6-3 |
| L | 2R | Toprak Avcibasi | 2-6 6-3 2-6 |
2022 J3 HAMBURG
| W | 1R | Flynn Tjark Baumert | 6-4 6-3 |
| L | 2R | Dominic Ducariu | 5-7 4-6 |
2022 J4 HAMBURG
| L | 2R | Flynn Tjark Baumert | 6-3 3-6 4-6 |
2022 J4 OSLO
| W | 1R | Albert Saar | 6-2 2-6 7-6 |
| W | 2R | Yakup Uzunel | 6-4 6-0 |
| W | QF | Filip Hanzelin | 6-4 6-1 |
| L | SF | Teo Masera | 3-6 6-7 |
2022 J4 FREDERIKSBERG
| W | 1R | Daan Meijer | 6-7 6-3 6-0 |
| W | 2R | Alfons Ridstrom | 6-4 2-6 6-3 |
| L | QF | Oskar Jansson | 5-7 4-6 |
2022 J5 WARSAW
| L | 1R | Alaa Trifi | 2-6 2-6 |
2022 J4 SIROKIBRIJEG-2
| W | 1R | Stefan Vedovelli | 6-3 6-1 |
| L | 2R | Maj Premzl | 6-2 5-7 1-6 |
2022 J4 SIROKIBRIJEG
| W | 1R | Danis Mijatovic | 6-0 6-0 |
| W | 2R | Stefan Vedovelli | 4-6 6-4 7-6 |
| L | QF | Maj Premzl | 2-6 5-7 |
2021 J5 SLOVENSKALUPCA
| L | 1R | Samuel Kyjaci | 1-6 4-6 |
2021 J4 ZILINA
| L | 1R | David Schwarc | 4-6 5-7 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9408, Number of registered players: 5,890, Number of registered results: 310,786