JK
ATP · Rank #194
ATP · Rank #194
Jan Kumstat
19yrs
1.98 m
91 kg
Right
#184Peak Rank
73.7%Accuracy
57
Matches Analyzed
Recent Form
LWWWW
Recent & Upcoming
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Y. Watanuki vs J. Kumstat, Challenger - Taipei, Chinese Taipei, 06:30, Finished. Match winner odds: 1.53 for Y. Watanuki, 2.38 for J. Kumstat. AI winner pick: Y. Watanuki, odds 1.51, confidence 2.6 out of 10. This tip won. Predicted score: 6-4, 7-6. Best AI tip: O18.5, odds 1.27, confidence 3.1 out of 10. This tip won.
Y. Watanuki
(Q)
J. Kumstat
Y. Shimizu vs J. Kumstat, Challenger - Taipei, Chinese Taipei, 05:00, Finished. Match winner odds: 2.4 for Y. Shimizu, 1.58 for J. Kumstat. AI winner pick: J. Kumstat, odds 1.58, confidence 4.6 out of 10. This tip won. Predicted score: 6-3, 3-6, 4-6. Best AI tip: J. Kumstat, odds 1.58, confidence 4.6 out of 10. This tip won.
Y. Shimizu
(Q)
J. Kumstat
J. Kumstat vs H. Mayot, Challenger - Taipei, Chinese Taipei, 03:20, Finished. Match winner odds: 2.33 for J. Kumstat, 1.6 for H. Mayot. AI winner pick: J. Kumstat, odds 2.33, confidence 2.0 out of 10. This tip won. Predicted score: 4-6, 6-3, 6-3. Best AI tip: O20.5, odds 1.42, confidence 2.5 out of 10. This tip won.
J. Kumstat
H. Mayot
J. Kumstat vs B. Harris, Challenger - Taipei, Chinese Taipei, 06:55, Finished. Match winner odds: 1.83 for J. Kumstat, 1.95 for B. Harris. AI winner pick: J. Kumstat, odds 1.83, confidence 2.2 out of 10. This tip won. Predicted score: 6-2, 4-6, 6-3. Best AI tip: O20.5, odds 1.44, confidence 2.4 out of 10. This tip won.
J. Kumstat
B. Harris
J. Schwaerzler vs J. Kumstat, Challenger - Taipei, Chinese Taipei, 08:40, Finished. Match winner odds: 1.9 for J. Schwaerzler, 1.92 for J. Kumstat. AI winner pick: J. Kumstat, odds 1.92, confidence 6.1 out of 10. This tip won. Predicted score: 4-6, 4-6. Best AI tip: J. Kumstat, odds 1.92, confidence 6.1 out of 10. This tip won.
J. Schwaerzler
J. Kumstat
06:30
Finished
0630
Y. Watanuki
(Q)
J. Kumstat
2
0
▾1.53
▴2.38
1
▾1.51
6476
O18.5
1.27
3.1/10
05:00
Finished
0500
Y. Shimizu
(Q)
J. Kumstat
0
2
▾2.4
▴1.58
2
▴1.58
633646
2
▴1.58
4.6/10
03:20
Finished
0320
J. Kumstat
H. Mayot
2
1
▴2.33
▾1.6
1
▴2.33
466363
O20.5
1.42
2.5/10
06:55
Finished
0655
J. Kumstat
B. Harris
2
0
1.83
1.95
1
1.83
624663
O20.5
▾1.44
2.4/10
08:40
Finished
0840
J. Schwaerzler
J. Kumstat
1
2
▾1.9
▴1.92
2
▴1.92
4646
2
▴1.92
6.1/10
J. Fearnley vs J. Kumstat, Challenger - Olbia, Italy, 14:45, Finished. Match winner odds: 1.42 for J. Fearnley, 2.8 for J. Kumstat. AI winner pick: J. Kumstat, odds 2.8, confidence 1.0 out of 10. This tip lost. Predicted score: 6-3, 3-6, 4-6. Best AI tip: O20.5, odds 1.67, confidence 1.0 out of 10. This tip lost.
J. Fearnley
(1)
J. Kumstat
J. Kumstat vs E. Butvilas, Challenger - Olbia, Italy, 14:55, Finished. Match winner odds: 2.23 for J. Kumstat, 1.63 for E. Butvilas. AI winner pick: J. Kumstat, odds 2.23, confidence 5.2 out of 10. This tip won. Predicted score: 6-3, 7-6. Best AI tip: J. Kumstat, odds 2.23, confidence 5.2 out of 10. This tip won.
J. Kumstat
E. Butvilas
14:45
Finished
1445
J. Fearnley
(1)
J. Kumstat
2
0
▾1.42
▴2.8
2
▴2.8
633646
O20.5
▴1.67
1.0/10
14:55
Finished
1455
J. Kumstat
E. Butvilas
2
0
▾2.23
▴1.63
1
▾2.23
6376
1
▾2.23
5.2/10
C. Tseng vs J. Kumstat, Challenger - Prague, Czech Republic, 13:00, Finished. Match winner odds: 3.05 for C. Tseng, 1.41 for J. Kumstat. AI winner pick: J. Kumstat, odds 1.41, confidence 4.2 out of 10. This tip won. Predicted score: 6-4, 3-6, 2-6. Best AI tip: J. Kumstat, odds 1.41, confidence 4.2 out of 10. This tip won.
C. Tseng
J. Kumstat
J. Kumstat vs F. Jianu, Challenger - Prague, Czech Republic, 13:15, Finished. Match winner odds: 1.29 for J. Kumstat, 3.55 for F. Jianu. AI winner pick: J. Kumstat, odds 1.29, confidence 4.3 out of 10. This tip won. Predicted score: 6-3, 6-4. Best AI tip: J. Kumstat, odds 1.29, confidence 4.3 out of 10. This tip won.
J. Kumstat
F. Jianu
M. Mrva vs J. Kumstat, Challenger - Prague, Czech Republic, 15:25, Finished. Match winner odds: 2.02 for M. Mrva, 1.83 for J. Kumstat. AI winner pick: J. Kumstat, odds 1.83, confidence 3.2 out of 10. This tip won. Predicted score: 4-6, 3-6. Best AI tip: J. Kumstat, odds 1.83, confidence 3.2 out of 10. This tip won.
M. Mrva
J. Kumstat
J. Kumstat vs S. Nagal, Challenger - Prague, Czech Republic, 10:45, Finished. Match winner odds: 1.5 for J. Kumstat, 2.67 for S. Nagal. AI winner pick: S. Nagal, odds 2.67, confidence 1.0 out of 10. This tip lost. Predicted score: 4-6, 6-3, 3-6. Best AI tip: O19.5, odds 1.47, confidence 1.3 out of 10. This tip won.
J. Kumstat
S. Nagal
(4)
P. Brunclik vs J. Kumstat, Challenger - Prague, Czech Republic, 13:15, Finished. Match winner odds: 2.22 for P. Brunclik, 1.68 for J. Kumstat. AI winner pick: J. Kumstat, odds 1.68, confidence 5.8 out of 10. This tip won. Predicted score: 6-2, 3-6, 3-6. Best AI tip: J. Kumstat, odds 1.68, confidence 5.8 out of 10. This tip won.
P. Brunclik
J. Kumstat
13:00
Finished
1300
C. Tseng
J. Kumstat
1
2
▴3.05
▾1.41
2
▾1.41
643626
2
▾1.41
4.2/10
13:15
Finished
1315
J. Kumstat
F. Jianu
2
0
▾1.29
▴3.55
1
▾1.29
6364
1
▾1.29
4.3/10
15:25
Finished
1525
M. Mrva
J. Kumstat
0
2
▴2.02
▾1.83
2
▾1.83
4636
2
▾1.83
3.2/10
10:45
Finished
1045
J. Kumstat
S. Nagal
(4) 2
0
1.5
2.67
2
2.67
466336
O19.5
▴1.47
1.3/10
13:15
Finished
1315
P. Brunclik
J. Kumstat
0
2
▾2.22
▴1.68
2
▴1.68
623636
2
▴1.68
5.8/10
J. Kumstat vs M. Möller, Challenger - Hamburg, Germany, 12:40, Finished. Match winner odds: 1.6 for J. Kumstat, 2.35 for M. Möller. AI winner pick: M. Möller, odds 2.35, confidence 1.5 out of 10. This tip lost. Predicted score: 2-6, 6-3, 4-6. Best AI tip: O18.5, odds 1.4, confidence 4.6 out of 10. This tip won.
J. Kumstat
(Q)
M. Möller
(A)
M. Pucinelli de vs J. Kumstat, Challenger - Hamburg, Germany, 13:15, Finished. Match winner odds: 2.63 for M. Pucinelli de, 1.51 for J. Kumstat. AI winner pick: J. Kumstat, odds 1.51, confidence 5.9 out of 10. This tip won. Predicted score: 4-6, 6-3, 3-6. Best AI tip: J. Kumstat, odds 1.51, confidence 5.9 out of 10. This tip won.
M. Pucinelli de
J. Kumstat
(Q)
C. Taberner vs J. Kumstat, Challenger - Hamburg, Germany, 13:40, Finished. Match winner odds: 2.35 for C. Taberner, 1.66 for J. Kumstat. AI winner pick: J. Kumstat, odds 1.66, confidence 3.1 out of 10. This tip won. Predicted score: 6-7, 4-6. Best AI tip: O18.5, odds 1.26, confidence 3.3 out of 10. This tip lost.
C. Taberner
J. Kumstat
(Q)
J. Kumstat vs M. Houkes, Challenger - Hamburg, Germany, 09:30, Finished. Match winner odds: 1.75 for J. Kumstat, 2.22 for M. Houkes. AI winner pick: J. Kumstat, odds 1.75, confidence 4.4 out of 10. This tip won. Predicted score: 6-3, 4-6, 6-3. Best AI tip: J. Kumstat, odds 1.75, confidence 4.4 out of 10. This tip won.
J. Kumstat
(Q)
M. Houkes
J. Mackenzie vs J. Kumstat, Challenger - Hamburg, Germany, 15:20, Finished. Match winner odds: 2.52 for J. Mackenzie, 1.56 for J. Kumstat. AI winner pick: J. Kumstat, odds 1.56, confidence 3.3 out of 10. This tip won. Predicted score: 3-6, 4-6. Best AI tip: J. Kumstat, odds 1.56, confidence 3.3 out of 10. This tip won.
J. Mackenzie
(WC)
J. Kumstat
12:40
Finished
1240
J. Kumstat
(Q)
M. Möller
(A) 2
1
▴1.6
▾2.35
2
▾2.35
266346
O18.5
▾1.4
4.6/10
13:15
Finished
1315
M. Pucinelli de
J. Kumstat
(Q) 1
2
▴2.63
▾1.51
2
▾1.51
466336
2
▾1.51
5.9/10
13:40
Finished
1340
C. Taberner
J. Kumstat
(Q) 0
2
▴2.35
▾1.66
2
▾1.66
6746
O18.5
▾1.26
3.3/10
09:30
Finished
0930
J. Kumstat
(Q)
M. Houkes
2
0
▴1.75
▾2.22
1
▴1.75
634663
1
▴1.75
4.4/10
15:20
Finished
1520
J. Mackenzie
(WC)
J. Kumstat
1
2
▾2.52
▴1.56
2
▴1.56
3646
2
▴1.56
3.3/10
Record by surface
Hard
14-9
Clay
26-9
Overall
40-18
Our AI on this player
42 correct of 57
From the matches in our database
Most-played opponents
Sumit Nagal
2 meetings
2-0
Marvin Möller
2 meetings
2-0
Thijs Boogaard
2 meetings
2-0
About Jan Kumstat
Jan Kumstat is a 19-year-old right-handed professional tennis player, currently ranked world No. 194. That is below a career-high of world No. 184. The serve is the main weapon: 8.4 aces per match and 77% of first-serve points won over the last 52 weeks. Against serve the numbers sit mid-table — 37.6% of points won, 28.5% of break chances taken. Across everything played, 58.7% of all points end up on this side of the net. The record is spread evenly across surfaces — Hard 14-9, Clay 26-9.
Right now the run is going well: 4 wins from the last 5 completed matches. The longest match we have on record ran to 35 games, against M. Möller. Predictions cover match winner and score, alongside serve, return and break-point statistics. Most recently seen in our data at Challenger Taipei Chinese Taipei.
Serve & Return
First Serve %
57.1%
1st Serve Won
72.9%
2nd Serve Won
56.6%
Aces / Match
11
Double Faults / Match
2.5
Break Pts Saved
68.9%
Break Pts Converted
6.9%
Return Pts Won
28.4%
Service Hold %
65.9%
Total Pts Won
47.8%
Records
Last 12 months
3
Titles
4
Finals
6
Semis or better
21
Events played
Tournament Results
Liberec, Czech Republic
Challenger
Winner
Hamburg, Germany
Challenger
Winner
Prague, Czech Republic
Challenger
Winner
ITF M15 Heraklion Men
ITF
Final
Bunschoten, Netherlands
Challenger
Semi-Finals
ITF M25 Ceska Lipa Men
ITF
Semi-Finals
ITF M15 Monastir Men
ITF
Quarter-Finals
ITF M25 Ollersbach Men
ITF
Quarter-Finals
ITF M25 Pszczyna Men
ITF
Quarter-Finals
Olbia, Italy
Challenger
Round of 16
Athens, Greece Men Singles
Challenger
Round of 16
ITF M25 Klosters Men
ITF
Round of 16
Como, Italy
Challenger
Round of 32
ITF M15 Monastir Men 2
ITF
Round of 32
ITF M25 Heraklion 2 Men
ITF
Round of 32
ITF M25 Trento Men
ITF
Round of 32
ITF M25 Zagreb Men
ITF
Round of 32
Prostejov, Czech Republic
Challenger
Round of 32
Seoul, South Korea
Challenger
Round of 32
Lyon
ATP
Qualifying
Troyes, France
Challenger
Qualifying
Deepest runs first, not by date
Season by season
2026so far
28–7
Won-lost
35
Matches
11–4
Tiebreaks
8.7
Aces / Match
2.6
Double Faults / Match
First Serve %
57.6%
1st Serve Won
77%
2nd Serve Won
56.6%
Break points won
36.4%
Break Pts Saved
73.5%
2025
3–2
Won-lost
5
Matches
—
Tiebreaks
2.4
Aces / Match
4.2
Double Faults / Match
First Serve %
58.1%
1st Serve Won
55.9%
2nd Serve Won
24.6%
Break points won
37.5%
Break Pts Saved
47.7%
2024
0–3
Won-lost
3
Matches
—
Tiebreaks
2
Aces / Match
4.3
Double Faults / Match
First Serve %
44.7%
1st Serve Won
61.8%
2nd Serve Won
35.1%
Break points won
20%
Break Pts Saved
51.7%
Season totals from the tour feed, singles only. The won-lost line is the tour's own count and can differ from the record under Predictions, which counts the matches we cover. A dash means the season holds nothing to measure that figure from.
Frequently asked questions
How accurate are the AI predictions for Jan Kumstat?
+
Our model has graded 57 matches involving Jan Kumstat and got 42 right — a hit rate of 73.7%. The 20 most recent are listed below, each with the pick we made and how it finished.
Who has Jan Kumstat played most often?
+
Of the matches we cover, Jan Kumstat has met Sumit Nagal most often — 2 times, with a 2-0 record.