JK
Jan Kumstat
CZE · Right-handed · 19 yrs
model rank
—
in the world
ATP rank
#661
current
record
33-31
ATP-level
── the model's read
How good is he, really?
Jan is the model's unrated. The model and the ATP broadly agree (ATP #661). Recent form: 24‑14 over the last 52 weeks.
── surface Elo
By surface
Hard—
Clay—
Grass—
── vs the rated field
Scouting
overall Eloinsufficient data
serve ratinginsufficient data
return ratinginsufficient data
percentile across players with a current rating
── model Elo over time
Elo trajectory
Elo — not enough data
── ATP ranking over time · lower is better
Ranking trajectory
── nearest on the rating profile
Similar players
Not enough rating data to find similar players.
── year by year
Seasons
| year | W-L | win% | titles |
|---|---|---|---|
| 2026 | 10-6 | 63% | |
| 2025 | 22-18 | 55% | |
| 2024 | 1-4 | 20% | |
| 2023 | 0-1 | 0% | |
| 2022 | 0-2 | 0% |
── filter the record · shareable link
Splits
All 64 matches — pick filters to split the record, serve/return and log below.
── career · point data
Serve & return profile
Serve
aces6.8%
double faults3.6%
1st serve in56%
1st serve won70%
2nd serve won47%
serve pts won60%
hold %71%
Return
return pts won40%
break %26%
BP conversion41%
Under pressure
BP saved (serve)57%
BP saved243/424
BP conversion41%
Career aggregate over 61 matches with point data · hold/break derived from break-point outcomes.
── 64 matches