Jan Kumstát
| Country (sports) |  Czech Republic |
|---|---|
| Born | 2 January 2007 Prostějov, Czech Republic |
| Plays | Right-handed |
| Prize money | $3,797 |
| Singles | |
| Highest ranking | No. 785 (18 August 2025) |
| Current ranking | No. 785 (18 August 2025) |
| Grand Slam singles results | |
| Australian Open Junior | F (2024) |
| French Open Junior | 1R (2025) |
| Wimbledon Junior | 2R (2024, 2025) |
| Doubles | |
| Highest ranking | No. 1122 (23 June 2025) |
| Current ranking | No. 1125 (30 June 2025) |
| Grand Slam doubles results | |
| Australian Open Junior | W (2025) |
| French Open Junior | 1R (2025) |
| Wimbledon Junior | F (2024) |
| Last updated on: 30 June 2025. | |
Jan Kumstát (born 2 January 2007) is a Czech tennis player. He won the boys' doubles event at the 2025 Australian Open.[1][2]
Career
In the summer of 2022 he won gold in the singles at the European Youth Olympic Festival in Banská Bystrica.[3]
He was part of the Czech team that won the 2023 Junior Davis Cup.[4]
Competing in the junior events at the 2024 Australian Open he made his debut at a junior grand slam tournament.[5] He defeated home favourite Hayden Jones on his way to reaching the final.[6][7] In the final he lost to Rei Sakamoto of Japan.[8] He also reached the quarter-finals in the boys' doubles with Norwegian partner Nicolai Budkov Kjær.[9]
Playing alongside compatriot Jan Klimas he reached the final of the boys' doubles at the 2024 Wimbledon Championships where they were defeated by Alexander Razeghi and Max Schönhaus.[10][11]
He went into the 2025 Australian Open as the highest-ranked junior in the tournament.[12] He reached quarter-final of the boys' singles at the Australian Open in 2025 where he lost to Henry Bernet.[13] He also reached the final of the boys' doubles alongside Maxwell Exsted, where they defeated Ognjen Milic and Egor Pleshivtsev for the title.[14][15]
Playing on Pro Tour in 2025 Kumstát reached his first two ITF singles finals at back to back events in Italy and Slovenia. In doubles he played another two finals with fellow Czech players David Poljak and Denis Peták. He also made his ATP Challenger Tour debut in Ostrava defeating Murphy Cassone in the first round.
Personal life
He is from Prostějov, he is the son of ice hockey player Pavel Kumstát and nephew of Petr Kumstát. His mother Kateřina was a volleyball player.[16]
Junior Grand Slam finals
Singles: 1 (1 runner-up)
| Result | Year | Tournament | Surface | Opponent | Score |
|---|---|---|---|---|---|
| Loss | 2024 | Australian Open | Hard |  Rei Sakamoto
|
6–3, 6–7(3–7), 5–7 |
Doubles: 2 (1 title, 1 runner-up)
| Result | Year | Tournament | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|
| Loss | 2024 | Wimbledon | Grass | Jan Klimas
|
 Alexander Razeghi Max Schönhaus
|
6–7(1–7), 4–6 |
| Win | 2025 | Australian Open | Hard | Maxwell Exsted
|
 Ognjen Milic Egor Pleshivtsev
|
7–6(8–6), 6–3 |
ITF World Tennis Tour finals
Singles: 2 (2 runner-ups)
| Legend |
|---|
| ITF WTT (0–2) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
|---|---|---|---|---|---|---|---|
| Loss | 0–1 | Jul 2025 | M15 Segrate, Italy | WTT | Clay |  Alexander Weis
|
4–6, 7–6(8–6), 1–6 |
| Loss | 0–2 | Aug 2025 | M15 Slovenska Bistrica, Slovenia | WTT | Clay | Juan Cruz Martin Manzano
|
4–6, 7–6(7–3), 1–4, ret. |
Doubles: 2 (2 runner-ups)
| Legend |
|---|
| ITF WTT (0–2) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|---|---|
| Loss | 0–1 | May 2025 | M15 Szentendre, Hungary | WTT | Clay | Denis Peták
|
 Alberto Barroso Campos.svg.png){kind=small} Johan Nikles
|
6–7(6–8), 6–7(5–7) |
| Loss | 0–2 | Jun 2025 | M25 Česká Lípa, Czech Republic | WTT | Clay | David Poljak
|
 Vladyslav Orlov Filippo Romano
|
6–7(4–6), 1–6 |
References
- ^ "Jan Kunstat". ATP. Retrieved 25 January 2024.
- ^ "Jan Kunstat". ITF. Retrieved 25 January 2024.
- ^ Kubatik, David (1 August 2022). "Isn't he Berdych's son? We are quite similar, says tennis player Kumstát". Denik.cz. Retrieved 25 January 2024.
- ^ Renton, Jamie (5 November 2023). "MAGIC MRVA LEADS CZECHIA TO DAVIS CUP JUNIORS CROWN". ITF. Retrieved 26 January 2024.
- ^ Novotny, Pavel (25 January 2024). "The young Czech shines at the Australian Open! In his first participation, he will play for the final". Sport.cz. Retrieved 26 January 2024.
- ^ Llewellyn Evans, Richard (25 January 2024). "CZECHIA'S KUMSTAT BOOKS AUSTRALIAN OPEN SEMIFINAL ON JUNIOR SLAM DEBUT". ITF. Retrieved 26 January 2024.
- ^ "Sensational success! The Czech talent will play the final at the premiere at the Australian Open". Sport.cz. 26 January 2024. Retrieved 26 January 2024.
- ^ "Top-seeded Renata Jamrichova wins junior girls' title. Japan's Rei Sakamoto wins boys' final". apnews. 27 January 2024. Retrieved 16 July 2024.
- ^ "Budkov Kjær continues in the Australian Open". nrk.no. 24 January 2024. Retrieved 25 January 2024.
- ^ "Finalistas do AO reeditam a decisão no juvenil de Wimbledon". tenisbrasil.uol.com.br. 13 July 2024. Retrieved 13 July 2024.
- ^ "Wimbledon: Who won the junior tournaments". tennis.net.pl. 15 July 2024. Retrieved 16 July 2024.
- ^ Worthington, Sam (20 January 2025). "Cruz Hewitt's nod to dad while giving world No.1 junior huge scare". Nine.com. Retrieved 22 January 2025.
- ^ "Swiss talent "sponsored" by Federer takes down the world junior number 1 at the 2025 Australian Open". puntodebreak.com. 23 January 2025. Retrieved 23 January 2025.
- ^ "Ognjen Milic-Egor Pleshivtsev vs Maxwell Exsted-Jan Kumstat - BD501". Australian Open. 24 January 2025. Retrieved 24 January 2025.
- ^ "Pár Siniaková, Townsendová nezklamal a v Austrálii bude hrát finále. Zverev vyřadil Djokoviče". ceskatelevize.cz. 24 January 2025. Retrieved 24 January 2025.
- ^ Sonnevend, Marek (13 August 2021). "Jan Kumstát: "Chtěli jsme do finále, ale i třetí místo je super"". Vecernikpv.cz. Retrieved 25 January 2024.