Jan Kumstát

Jan Kumstát
Country (sports) Czech Republic
Born (2007-01-02) 2 January 2007 (age 19)
Prostějov, Czech Republic
Height1.98 m (6 ft 6 in)
PlaysRight-handed (two-handed backhand)
Prize moneyUS $94,615
Singles
Career record0–0 (at ATP Tour level, Grand Slam level, and in Davis Cup)
Career titles0
Highest rankingNo. 184 (14 September 2026)
Current rankingNo. 187 (28 September 2026)
Doubles
Career record0–0 (at ATP Tour level, Grand Slam level, and in Davis Cup)
Career titles0
Highest rankingNo. 449 (28 September 2026)
Current rankingNo. 449 (28 September 2026)
Last updated on: 29 September 2026.

Jan Kumstát (born 2 January 2007) is a Czech tennis player. He has a career-high ATP singles ranking of No. 184 achieved on 14 September 2026 and a doubles ranking of No. 449 achieved on 28 September 2026.

Kumstát won the boys' doubles title at the 2025 Australian Open.

Junior career

In the summer of 2022, Kumstát won gold in the singles at the European Youth Olympic Festival in Banská Bystrica.

He was part of the Czech team that won the 2023 Junior Davis Cup.

He made his Junior Grand Slam debut at the 2024 Australian Open. He defeated local opponent Hayden Jones on his way to reaching the final, where he lost to Japanese Rei Sakamoto. He also reached the quarterfinals in the doubles category, with Norwegian Nicolai Budkov Kjær.

Playing with compatriot Jan Klimas, Kumstát was a runner-up in the boys' doubles event at the 2024 Wimbledon Championships. The pair was defeated by Alexander Razeghi and Max Schönhaus in the final.

Kumstát went into the 2025 Australian Open as the highest-ranked junior in the tournament. He reached the quarterfinals in boys' singles, but lost to Swiss Henry Bernet. Despite that loss, a few days later he reached the doubles final in Melbourne, with American Maxwell Exsted. They were crowned champions of that event, defeating Ognjen Milić and Egor Pleshivtsev in straight sets.

Kumstát also had good results on the ITF junior circuit, maintaining a 76–40 singles win-loss record and reached an ITF junior combined ranking of world No. 3 on 6 January 2025.

Professional career

2025: Pro beginnings

Playing on Pro Tour 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.

2026: Three successive Challenger titles, top 200

In August, he won his second ATP Challenger title at the 2026 Hamburg Ladies & Gents Cup, following his triumph on home soil in Liberec, earlier in the month. As a result, he reached the top 250, raising 100 positions in the ATP singles rankings on 24 August 2026. He won his third Challenger title in a row as a teenager, the third to accomplish the feat after Guillermo Coria and Grigor Dimitrov, at home at the 2026 Sekyra Group Prague Open by Advantage Cars and reached the top 200 on 24 August 2026.

Personal life

Kumstát is from Prostějov, Czechia. He is the son of former ice hockey player Pavel Kumstát and nephew of Petr Kumstát. His mother, Kateřina, was a professional volleyball player.

ATP Challenger Tour finals

Singles: 3 (3 titles)

Legend
ATP Challenger (3–0)
Finals by surface
Clay (3–0)
Result W–L    Date    Tournament Tier Surface Opponent Score
Win 1–0 Aug 2026 Svijany Open, Czech Republic Challenger Clay Peru Gonzalo Bueno 6–3, 6–1
Win 2–0 Aug 2026 Hamburg Ladies & Gents Cup, Germany Challenger Clay Germany Marvin Möller 4–6, 7–6(7–5), 7–5
Win 3–0 Aug 2026 Prague Open, Czech Republic Challenger Clay Chinese Taipei Tseng Chun-hsin 5–7, 6–3, 6–0

ITF World Tennis Tour finals

Singles: 3 (3 runner-ups)

Legend
ITF WTT (0–3)
Finals by surface
Hard (0–1)
Clay (0–2)
Result W–L    Date    Tournament Tier Surface Opponent Score
Loss 0–1 Jul 2025 M15 Segrate, Italy WTT Clay Italy Alexander Weis 4–6, 7–6(8–6), 1–6
Loss 0–2 Aug 2025 M15 Slovenska Bistrica, Slovenia WTT Clay Italy Juan Cruz Martin Manzano 4–6, 7–6(7–3), 1–4, ret.
Loss 0–3 Mar 2026 M15 Heraklion, Greece WTT Hard United Kingdom Henry Searle 2–6, 2–6

Doubles: 4 (2 titles, 2 runner-ups)

Legend
ITF WTT (2–2)
Finals by surface
Hard (2–0)
Clay (0–2)
Result W–L    Date    Tournament Tier Surface Partner Opponents Score
Loss 0–1 May 2025 M15 Szentendre, Hungary WTT Clay Czech Republic Denis Peták Spain Alberto Barroso Campos
Switzerland Johan Nikles		 6–7(6–8), 6–7(5–7)
Loss 0–2 Jun 2025 M25 Česká Lípa, Czech Republic WTT Clay Czech Republic David Poljak Ukraine Vladyslav Orlov
Italy Filippo Romano		 6–7(4–7), 1–6
Win 1–2 Sep 2025 M15 Monastir, Tunisia WTT Hard Poland Piotr Pawlak France Adan Freire da Silva
France Yanis Ghazouani Durand		 7–5, 6–3
Win 2–2 Jan 2026 M15 Monastir, Tunisia WTT Hard Czech Republic Jakub Nicod Netherlands Pieter De Lange
Armenia Daniil Sarksian		 6–3, 6–7(5–7), [11–9]

Junior Grand Slam finals

Singles: 1 (runner-up)

Result Year Tournament Surface Opponent Score
Loss 2024 Australian Open Hard Japan 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 Czech Republic Jan Klimas United States Alexander Razeghi
Germany Max Schönhaus		 6–7(1–7), 4–6
Win 2025 Australian Open Hard United States Maxwell Exsted Serbia Ognjen Milić
Egor Pleshivtsev		 7–6(8–6), 6–3

References

  1. 1 2 "Jan Kunstat". ATP. Retrieved 25 January 2024.
  2. ↑ "Jan Kunstat". ITF. Retrieved 25 January 2024.
  3. ↑ 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.
  4. ↑ Renton, Jamie (5 November 2023). "MAGIC MRVA LEADS CZECHIA TO DAVIS CUP JUNIORS CROWN". ITF. Retrieved 26 January 2024.
  5. ↑ 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.
  6. ↑ Llewellyn Evans, Richard (25 January 2024). "CZECHIA'S KUMSTAT BOOKS AUSTRALIAN OPEN SEMIFINAL ON JUNIOR SLAM DEBUT". ITF. Retrieved 26 January 2024.
  7. ↑ "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.
  8. ↑ "Top-seeded Renata Jamrichova wins junior girls' title. Japan's Rei Sakamoto wins boys' final". apnews. 27 January 2024. Retrieved 16 July 2024.
  9. ↑ "Budkov Kjær continues in the Australian Open". nrk.no. 24 January 2024. Retrieved 25 January 2024.
  10. ↑ "Finalistas do AO reeditam a decisão no juvenil de Wimbledon". tenisbrasil.uol.com.br. 13 July 2024. Retrieved 13 July 2024.
  11. ↑ "Wimbledon: Who won the junior tournaments". tennis.net.pl. 15 July 2024. Retrieved 16 July 2024.
  12. ↑ 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.
  13. ↑ "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.
  14. ↑ "Ognjen Milic-Egor Pleshivtsev vs Maxwell Exsted-Jan Kumstat - BD501". Australian Open. 24 January 2025. Retrieved 24 January 2025.
  15. ↑ "Pár Siniaková, Townsendová nezklamal a v Austrálii bude hrát finále. Zverev vyřadil Djokoviče". ceskatelevize.cz. 24 January 2025. Retrieved 24 January 2025.
  16. ↑ "Jan Kumstat Junior Results".
  17. ↑ "Kumstát má první titul a vyletí skoro o 200 míst. Český talent ovládl challenger v Liberci" (in Czech). 2 August 2026.
  18. ↑ "Kumstat Claims Hamburg Ladies & Gents Cup Crown As Moeller Falls Short In Home Final". 16 August 2026.
  19. ↑ "#NextGenATP Kumstat, 19, joins Coria & Dimitrov in Challenger history". 24 August 2026.
  20. ↑ Sonnevend, Marek (13 August 2021). "Jan Kumstát: "Chtěli jsme do finále, ale i třetí místo je super"". Vecernikpv.cz (in Czech). Retrieved 25 January 2024.