Jan Kumstat

2025

US OPEN JUNIOR		3R
WIMBLEDON JUNIOR		2R
J300 ROEHAMPTON		2R
ROLAND GARROS JUNIOR	[15]	1R
AUSTRALIAN OPEN JUNIOR	[1]	Quarter
J300 TRARALGON	[1]	3R

2024

J500 PLANTATION	[3]	2R
J300 BRADENTON	[2]	1R
J300 BEIJING	[1]	Semi
J500 OSAKA	[1]	Quarter
WIMBLEDON JUNIOR	[6]	2R
J300 PLOVDIV	[1]	Win
J500 CAIRO	[1]	2R
AUSTRALIAN OPEN JUNIOR		Final
J300 TRARALGON		2R

2023

J500 OSAKA		1R
J300 BEIJING	[6]	Semi
J200 RAKOVNIK	[2]	Final
J300 PANCEVO		2R
J300 PRAGUE	[10]	Quarter
J300 BAMBERG		3R
J200 PIESTANY	[10]	Final
J300 PLOVDIV		2R
J300 VILLENA		2R
J300 CASABLANCA		2R
J200 SIAULIAI	[8]	Semi
J200 BRATISLAVA	[8]	Semi

2022

J3 TRNAVA-2	[5]	2R
J2 SZEKESFEHERVAR		Quarter
J3 DUBROVNIK	[8]	1R
J2 RAKOVNIK		Quarter
J3 PRAGUE-2		1R
J1 PRAGUE		1R
J2 PILSEN		2R
J3 SOBOTA		Quarter
J3 CAKOVEC		Semi
J2 PIESTANY		Quarter
J4 OSLO		1R
J4 PUSZCZYKOWO		Quarter
J5 PRAGUE		Semi

Nation

CZE

Generation

Born in 2007 (17-18 years old)

World Ranking

Junior World Ranking　27th

ATP Ranking　793th

Year-end Junior World Ranking

Rival

Alexander Vasilev (1-2)

[2025] J300ROEHAMPTON 4-6 6-3 3-6
[2025] US OPEN JUNIOR 5-7 6-4 6-7
[2024] WIMBLEDON JUNIOR 4-6 7-6 7-6

Dominick Mosejczuk (2-0)

[2025] J300TRARALGON 6-1 6-2
[2024] J500PLANTATION 4-6 6-3 6-3

William Rejchtman Vinciguerra (1-1)

[2025] J300TRARALGON 7-6 5-7 2-6
[2023] J200SIAULIAI 6-4 6-4

Izan Almazan Valiente (2-0)

[2024] J300PLOVDIV 6-4 4-6 6-2
[2023] J200RAKOVNIK 6-2 7-5

Oliver Bonding (1-1)

[2024] J300BEIJING 2-6 4-6
[2023] J300BEIJING 6-2 2-6 6-3

Match Details

2025 US OPEN JUNIOR

W	1R	Nicolas Arseneault	6-2 7-6
W	2R	Gavin Goode	6-2 6-4
L	3R	Alexander Vasilev	5-7 6-4 6-7

2025 WIMBLEDON JUNIOR

W	1R	Kriish Tyagi	6-3 6-3
L	2R	Jack Kennedy	6-7 6-7

2025 J300 ROEHAMPTON

W	1R	Jack Secord	6-2 6-3
L	2R	Alexander Vasilev	4-6 6-3 3-6

2025 AUSTRALIAN OPEN JUNIOR

W	1R	Maximus Dussault	6-2 6-2
W	2R	Cruz Hewitt	6-3 7-6
W	3R	Moise Kouame	6-3 3-6 6-3
L	QF	Henry Bernet	6-7 6-7

2025 J300 TRARALGON

W	1R	Luis Guto Miguel	6-2 6-3
W	2R	Dominick Mosejczuk	6-1 6-2
L	3R	William Rejchtman Vinciguerra	7-6 5-7 2-6

2024 J500 PLANTATION

W	1R	Dominick Mosejczuk	4-6 6-3 6-3
L	2R	Timofei Derepasko	4-6 6-1 4-6

2024 J300 BEIJING

W	2R	Ye Chen	6-3 6-1
W	3R	Kerem Yilmaz	6-3 6-3
W	QF	Nikita Bilozertsev	6-2 3-0
L	SF	Oliver Bonding	2-6 4-6

2024 J500 OSAKA

W	1R	Ilya Maltsev	4-6 6-0 6-3
W	2R	Hyu Kawanishi	6-3 6-4
W	3R	Shion Itsusaki	6-4 6-4
L	QF	Hoyoung Roh	1-6 7-5 4-6

2024 WIMBLEDON JUNIOR

W	1R	Alexander Vasilev	4-6 7-6 7-6
L	2R	Jagger Leach	4-6 6-7

2024 J300 PLOVDIV

W	1R	Sergio Planella Hernandez	6-4 6-4
W	2R	Gabriel Ghetu	6-4 6-3
W	QF	Theo Papamalamis	7-6 7-5
W	SF	Anas Mazdrashki	2-6 6-0 6-3
W	F	Izan Almazan Valiente	6-4 4-6 6-2

2024 J500 CAIRO

W	1R	Lovro Maricic	6-3 6-3
L	2R	Pierluigi Basile	6-4 5-7

2024 AUSTRALIAN OPEN JUNIOR

W	1R	Tianhui Zhang	6-4 6-3
W	2R	Charlie Robertson	6-7 7-6 6-3
W	3R	Alexander Razeghi	7-6 6-2
W	QF	Hayden Jones	6-7 6-2 7-5
W	SF	Mees Rottgering	6-1 6-3
L	F	Rei Sakamoto	6-3 6-7 5-7

2024 J300 TRARALGON

W	1R	Jagger Leach	6-3 6-4
L	2R	Pavle Marinkov	4-6 3-6

2023 J300 BEIJING

W	2R	Eren Matthew Cheung	6-1 6-4
W	3R	Goncalo Marques	7-6 7-6
W	QF	Oliver Bonding	6-2 2-6 6-3
L	SF	Benjamin Gusic Wan	3-6 1-6

2023 J200 RAKOVNIK

W	2R	Krystof Svojgr	6-4 6-4
W	3R	Andreas Loizas	6-3 7-5
W	QF	Lorenzo Angelini	6-4 6-3
W	SF	Izan Almazan Valiente	6-2 7-5
L	F	Adrien Berrut	4-6 4-6

2023 J300 PANCEVO

W	1R	Danial Rakhmatullayev	6-2 6-2
L	2R	Anas Mazdrashki	6-7 4-6

2023 J300 PRAGUE

W	2R	Jan Klimas	7-5 6-4
W	3R	Aleksa Pisaric	6-7 7-6 6-2
L	QF	Jakub Filip	4-6 7-6 4-6

2023 J300 BAMBERG

W	1R	Manvydas Balciunas	6-1 6-7 6-4
W	2R	Max Dahlin	6-2 4-3
L	3R	Diego Dedura	6-7 5-7

2023 J200 PIESTANY

W	2R	Nico Hipfl	7-6 3-6 6-1
W	3R	Yannik Kelm	6-2 6-1
W	QF	Semen Aginskiy	6-3 6-3
W	SF	Ignacio Parisca	6-3 6-4
L	F	Jan Hrazdil	6-2 6-7 5-7

2023 J300 PLOVDIV

W	1R	Reiya Hattori	6-2 6-2
L	2R	Iliyan Radulov	6-3 2-6 6-7

2023 J300 VILLENA

W	1R	Giacomo Nosei	6-2 2-6 6-3
L	2R	Roger Pascual Ferra	1-6 2-6

2023 J300 CASABLANCA

W	1R	Ibrahim Benyahia	6-3 6-0
L	2R	Kevin Edengren	4-6 3-6

2023 J200 SIAULIAI

W	1R	Erik Tkalenko	5-7 6-0 6-4
W	2R	Julius Augunas	6-4 6-3
W	QF	William Rejchtman Vinciguerra	6-4 6-4
L	SF	Thijs Boogaard	3-6 4-6

2023 J200 BRATISLAVA

W	1R	Ziga Svec	6-3 6-2
W	2R	Oskar Grzegorzewski	6-4 6-4
W	QF	Filip Hanzelin	6-3 7-6
L	SF	Petr Brunclik	5-7 7-6 4-6

2022 J3 TRNAVA-2

W	1R	Valentin Faure	6-7 6-3 6-3
L	2R	Ziga Svec	3-6 3-6

2022 J2 SZEKESFEHERVAR

W	1R	Lorant Gyori	6-0 6-2
W	2R	Fabio De Michele	6-4 1-6 6-1
L	QF	Yannik Kelm	6-7 1-6

2022 J2 RAKOVNIK

W	1R	Bence Juhasz	6-0 6-0
W	2R	Matic Kriznik	6-1 6-2
W	3R	Denis Petak	5-7 6-4 6-0
L	QF	Vit Kalina	5-7 6-4 3-6

2022 J2 PILSEN

W	1R	Goncalo Marques	6-4 6-2
L	2R	Branko Djuric	3-6 6-4 2-6

2022 J3 SOBOTA

W	1R	Igor Mandou Berranger	5-7 6-3 6-3
W	2R	Jeiden Saidizand	6-3 6-7 6-4
L	QF	Adam Duda	6-4 1-6 5-7

2022 J3 CAKOVEC

W	1R	Lovro Maricic	6-3 6-0
W	2R	Lucio Ratti	6-3 6-2
W	QF	Sasa Markovic	6-3 6-2
L	SF	Tomasz Berkieta	2-6 3-6

2022 J2 PIESTANY

W	1R	Marek Nano	5-7 6-3 6-2
W	2R	Noah Merre	6-4 6-7 6-2
W	3R	Tomas Zlatohlavek	1-6 6-4 6-3
L	QF	Maxim Mrva	4-6 0-6

2022 J4 PUSZCZYKOWO

W	1R	Alan Wazny	6-4 6-4
W	2R	Piotr Czaczkowski	6-7 6-4 6-3
L	QF	Juho Eric Biggs	6-7 3-6

2022 J5 PRAGUE

W	1R	Oldrich Vejsicky	6-3 6-4
W	2R	Andriy Poritskyy	6-2 7-6
W	QF	Vojtech Vales	6-2 6-3
L	SF	Jakub Filip	4-6 7-5 4-6

Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9586, Number of registered players: 5,950, Number of registered results: 317,378