Niels Van Der Sijs
2024
| J100Thehague | 2R | |
| J30Rotterdam | [2] | 1R |
2023
| J30Arnhem | [5] | 2R |
| J60Emmeloord | Quarter | |
| J30Hasselt-2 | [8] | 2R |
| J60Eindhoven | 3R | |
| J60Hillegom | 2R | |
| J60Thehague | 2R | |
| J30Girona | [3] | 1R |
| J30Hasselt | [5] | Quarter |
| J100Doorn | 1R | |
| J30Thehague | [4] | Semi |
| J30Dublin | [2] | 2R |
| J60Arlon | 1R |
2022
| J4Emmeloord | 1R | |
| J5Esch-Alzette | [4] | 2R |
| J4Eindhoven | 2R | |
| J5Garisart | [3] | Quarter |
| J4Limelette | [16] | 2R |
| J5Niksic | [4] | 2R |
| J5Sousse | 1R | |
| J5Gazelec | Win | |
| J5Doorn | 2R |
Nation
NED
Match Details
2024 J100Thehague
| W | 1R | Timothee Andriveau | 2-6 7-6 6-4 |
| L | 2R | Charles Chen | 4-6 2-6 |
2024 J30Rotterdam
| L | 1R | Nand Vandepoele | 4-6 6-7 |
2023 J30Arnhem
| L | 2R | Daniel Franco-Key | 1-6 4-6 |
2023 J60Emmeloord
| W | 1R | Xavier Jakubovic | 6-2 6-3 |
| W | 2R | Sammy Guinau | 6-3 6-4 |
| L | QF | Rein Koenders | 5-7 5-7 |
2023 J30Hasselt-2
| L | 2R | Alberto Velotta | 3-6 3-6 |
2023 J60Eindhoven
| W | 1R | Thomas Van Den Dooren | 6-7 6-1 6-4 |
| W | 2R | Sean O Nuallain | 6-1 6-1 |
| L | 3R | Karel Froemel | 6-2 6-7 1-6 |
2023 J60Hillegom
| W | 1R | Hyu Kawanishi | 7-6 6-3 |
| L | 2R | Christos Glavas | 6-7 5-7 |
2023 J60Thehague
| W | 1R | Gustav Andersson | 6-0 6-0 |
| L | 2R | Raphael Vaksmann | 2-6 4-6 |
2023 J30Girona
| L | 1R | Mario Arce Fernandez | 3-6 4-6 |
2023 J30Hasselt
| W | 2R | Fabio Felsner | 6-3 6-3 |
| W | 3R | Axel Huysmans | 7-6 3-6 6-1 |
| L | QF | Gianluca Kunz | 6-3 6-7 4-6 |
2023 J100Doorn
| L | 1R | Loan Lestir | 2-6 3-6 |
2023 J30Thehague
| W | 2R | Kaj Glaser | 6-1 6-3 |
| W | 3R | Joao Luis Silva | 7-5 7-6 |
| W | QF | Gabriele Crivellaro | 7-6 5-7 7-5 |
| L | SF | Hidde Schoenmakers | 6-2 4-6 0-6 |
2023 J30Dublin
| W | 1R | Liam Hickey | 6-4 6-2 |
| L | 2R | Xavi Palomar | 5-7 4-6 |
2023 J60Arlon
| L | 1R | Kylian Collignon | 6-3 5-7 0-6 |
2022 J4Emmeloord
| L | 1R | Niels Roemeling | 4-6 4-6 |
2022 J5Esch-Alzette
| W | 1R | Finn Pauly | 6-1 6-4 |
| L | 2R | Jules Caby | 4-6 1-6 |
2022 J4Eindhoven
| W | 1R | Thomas Mathys | 6-3 6-2 |
| L | 2R | Noah Gabriel | 3-6 4-6 |
2022 J5Garisart
| W | 1R | Remi Heldenbergh | 6-3 6-1 |
| W | 2R | Matias Lofink | 6-1 6-4 |
| L | QF | Jonas Kucera | 0-6 1-6 |
2022 J4Limelette
| L | 2R | Moise Kouame | 3-6 6-4 4-6 |
2022 J5Niksic
| W | 1R | Pavle Popovich | 6-2 6-3 |
| L | 2R | Balsa Djokovic | 1-6 4-6 |
2022 J5Sousse
| L | 1R | Achref Ltaief | 4-6 3-6 |
2022 J5Gazelec
| W | 1R | Youssef Boubaker | 6-3 1-6 6-3 |
| W | 2R | Ibrahim Benyahia | 6-2 6-1 |
| W | QF | Ibrahim Snoussi | 6-4 6-1 |
| W | SF | Yessine Kerouat | 7-5 6-1 |
| W | F | Zechariah Hamrouni | 5-7 6-4 6-3 |
2022 J5Doorn
| W | 1R | Kylian Collignon | 6-3 6-2 |
| L | 2R | Stefan Vedovelli | 4-6 2-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9640, Number of registered players: 5,431, Number of registered results: 268,519