Jan Kumstat

🇨🇿Czech Republic· #187· 19y· Right-handed· ATP

40–19 · last 52 weeks

29–8 on clay in the last 52 weeks, his best surface. Up from #649 in March.

Last match

Como Challenger · R32 · Clay · Aug 31, 2026

Hard 11–11Clay 29–8

Season	Total	Hard	Clay	Grass	Indoor
All	60–4060%	11–1150%	46–2367%	—	3–633%
2026	37–1473%	6–460%	29–878%	—	2–250%†
2025	22–1855%	5–742%	17–965%	—	0–20%†
2024	1–420%	—	0–30%†	—	1–150%†
2023	0–10%†	—	0–10%†	—	—
2022	0–30%†	—	0–20%†	—	0–10%†

† fewer than 5 matches

Como Challenger · ChallengerClay · 2026

Prague Challenger · ChallengerClay · 2026

Averages exclude retirements and defaults

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Surface

Level

Opponent rank

Window

Category	W–L	Win	Spread	Games	Hold
HardOpp ~#560	11–11	50%	−0.1	21.0	73%(17)
ClayOpp ~#332	29–8	78%	−3.1	22.8	90%(34)

Category	W–L	Win	Spread	Games	Hold
ChallengerOpp ~#284	27–7	79%	−2.9	22.6	87%(32)
ITFOpp ~#624	13–12	52%	−0.7	21.5	79%(19)
vs 100+	32–17	65%	−1.5	22.1	83%(45)
vs Unranked	8–2	80%	−4.3	22.1	95%(6)
vs LeftiesOpp ~#377	5–1	83%	−2.7	20.3	89%(6)
vs RightiesOpp ~#361	27–15	64%	−1.5	22.7	83%(38)

Category	W–L	Win	Spread	Games	Hold
First match of eventOpp ~#506	12–9	57%	−1.1	21.8	80%(15)
Later roundsOpp ~#288	21–9	70%	−2.2	22.3	84%(28)

Metric	L5	L10	L52 Wks
Hold %	86%	90%	84%
Break %	35%	27%	29%

L52 Wks:Ace rate 11.1%1st-serve points won 75%Dominance ratio 1.47

51 matches with serve stats

Averages exclude retirements and defaults