Jan Kumstat

2025

Roland Garros Junior	[15]	1R
Australian Open Junior	[1]	Quarter
J300Traralgon	[1]	3R

2024

J500Plantation	[3]	2R
J300Bradenton	[2]	1R
J300Beijing	[1]	Semi
J500Osaka	[1]	Quarter
Wimbledon Junior	[6]	2R
J300Plovdiv	[1]	Win
J500Cairo	[1]	2R
Australian Open Junior		Final
J300Traralgon		2R

2023

J500Osaka		1R
J300Beijing	[6]	Semi
J200Rakovnik	[2]	Final
J300Pancevo		2R
J300Prague	[10]	Quarter
J300Bamberg		3R
J200Piestany	[10]	Final
J300Plovdiv		2R
J300Villena		2R
J300Casablanca		2R
J200Siauliai	[8]	Semi
J200Bratislava	[8]	Semi

Nation

CZE

Generation

Born in 2007 (17-18 years old)

World Ranking

Junior World Ranking　18th

ATP Ranking　1010th

Year-end Junior World Ranking

Rival

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

Jagger Leach (1-1)

[2024] WIMBLEDON JUNIOR 4-6 6-7
[2024] J300TRARALGON 6-3 6-4

Match Details

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 J300Traralgon

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 J500Plantation

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

2024 J300Beijing

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 J500Osaka

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 J300Plovdiv

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 J500Cairo

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 J300Traralgon

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

2023 J300Beijing

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 J200Rakovnik

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 J300Pancevo

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

2023 J300Prague

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 J300Bamberg

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

2023 J200Piestany

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 J300Plovdiv

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

2023 J300Villena

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

2023 J300Casablanca

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

2023 J200Siauliai

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 J200Bratislava

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

Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9482, Number of registered players: 4,990, Number of registered results: 217,154