CzechiaLiberec - Czech RepublicFinished

Predictions graded

Zdenek Kolar #154Czechia1Jan Kumstat #509Czechia2

Sets 2-6 · 6-4 · 3-6Mon 27 Jul 2026, 13:55 Predictions gradedFirst RoundClay

Predictions6–275%

Edges1–150%

Player Profiles

Ranking advantageZdenek Kolar · 355 places

Zdenek Kolar

Czechia

Career-high No. 111 came on 2022-06-13. His career record is heavily clay-weighted, and his 2025 Challenger results pulled him back toward the top 200 before this 2026 top-160 position.

Current ranking: #154
Peak ranking: #111 · 2022
Current age: 29
Preferred surface: Clay
Hand: Right handed
Height: 183 cm

Jan Kumstat

Czechia

Nineteen-year-old Czech right-hander. Public profiles list hard as his preferred surface, and his current career-high singles ranking was reached on 2026-07-20.

Current ranking: #509
Peak ranking: #509 · 2026
Current age: 19
Preferred surface: Hard
Hand: Right handed
Height: 196 cm

Quick Take

Pre-match view

Context last updated 26 Jul 2026, 21:44 · Europe/Bucharest

Jan Kumstat's superior recent clay form and dominant serve give him a slight edge over top seed Zdenek Kolar, who has struggled in July.

The best betting value lies in over 21.5 total games and over 9.5 total aces, while Kumstat's match-winner odds offer only a marginal edge.

Context

Kumstat won five singles matches at Bunschoten from July 12-17, then two more on July 22-23 before a quarterfinal loss on July 24.
- He also played a doubles final on July 25 and is scheduled for doubles on July 28, adding to his match load.
- Kolar has not played since July 20, giving him a freshness edge.
In his last 15 clay matches, Kolar's first-serve points won is 63.7% and he averages 1.7 aces per match.
- He saves only 52.2% of break points on clay, indicating vulnerability under pressure.
- Kumstat's first-serve points won is 75%, highlighting the serve gap.
Kumstat's last 15 clay matches show 8.1 aces per match and 75% first-serve points won.
- He has a 9-6 record on clay in this window, with a 61.8% sets-won rate.
- Kolar's return points won is 42%, which may not be enough to break Kumstat consistently.

BetBugs edges

Compare BetBugs' chances with the market's.

BetBugs probabilities

How likely BetBugs thought each outcome was.

Result1 of 1 landed

Signal quality Medium · Uncertainty band Slight lean · Market price 1.83
The read
Kumstat's stronger recent clay form and serve advantage outweigh Kolar's ranking edge, making him a slight favorite.
- Kumstat last 15 clay: 9-6 record, 61.8% sets won, 54.6% games won, 52.2% total points won.
- Kolar last 15 clay: 6-8 record, 50% sets won, 50.3% games won, 50.1% total points won.
- Kumstat holds a serve edge: 75% first-serve points won vs Kolar's 63.7%, and 8.1 aces per match vs 1.7.
- Kumstat's recent form: 7-2 in last 9 completed matches, including wins over Squire (218) and Broska (285).
BetBugs · Match WinnerwonJan KumstatEstimated chance55%

Games2 of 3 landed

Signal quality Medium · Uncertainty band Lean · Not priced
The read
With both players winning about half their games, a close match likely exceeds 21.5 total games.
- Kolar's last 15 clay matches average 22.1 games per match (310 games / 14 matches).
- Kumstat's last 15 clay matches average 21.6 games per match (324 games / 15 matches).
- Both players have similar games-won percentages (~50%), indicating competitive sets.
BetBugs · Total GameswonOver 21.5Estimated chance60%
Signal quality Medium · Uncertainty band Lean · Market price 1.91
The read
The first set is likely to be competitive, with an average length above 9.5 games.
- Kolar's last 15 clay first sets average 9.6 games (134 games / 14 matches).
- Kumstat's last 15 clay first sets average 9.5 games (142 games / 15 matches).
- Both players have first-set win rates near 50%, suggesting tight opening sets.
BetBugs · Set 1 Total GameslostOver 9.5Estimated chance58%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Second sets have also averaged close to 9.5 games, supporting a slight lean to the over.
- Kolar's last 15 clay second sets average 9.4 games.
- Kumstat's last 15 clay second sets average 9.3 games.
- Both players have similar second-set competitiveness, with no clear dominance.
BetBugs · Set 2 Total GameswonOver 9.5Estimated chance55%

Sets1 of 1 landed

Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Kumstat's higher first-set win rate and serve strength suggest a marginal edge in the opening set.
- Kumstat first-set win rate in last 15: 60% (9 of 15).
- Kolar first-set win rate in last 15: 40% (6 of 15).
- Kumstat's first-serve points won (75%) gives him a slight edge in holding early.
BetBugs · Set 1 WinnerwonJan KumstatEstimated chance52%

Match stats0 of 0 landed

Signal quality Medium · Uncertainty band Lean · Not priced
The read
Kumstat's high ace count alone pushes the total over 9.5 in most matches.
- Kumstat averages 8.1 aces per match in last 15 clay matches.
- Kolar averages 1.7 aces per match in last 15 clay matches.
- Combined average is 9.8 aces per match, with Kumstat's serve being the main driver.
BetBugs · Total AcesOver 9.5Estimated chance62%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Both players have moderate double fault rates, making over 5.5 likely.
- Kolar averages 3.6 double faults per match in last 15 clay.
- Kumstat averages 2.7 double faults per match in last 15 clay.
- Combined average is 6.3 double faults per match.
BetBugs · Total Double FaultsOver 5.5Estimated chance55%

Markets to Avoid

High-risk markets where price or context leaves too little cushion.

Pre-match flagged 2 avoid-market areas; caution remains warranted in high-variance spots.

Zdenek Kolar

6W 9L

6-3 6-2#276Thiago Seyboth Wild

4-6 6-3 6-4#50Juan Manuel Cerundolo

6-4 6-3#192Taro Daniel

7-5 6-0#402Stefan Palosi

6-3 6-3#189Tom Gentzsch

4-6 6-4 6-3#184Federico Cina

6-4 6-4#559Lukas Pokorny

6-3 6-1#896Jason Jung

7-5 6-1#194Lautaro Midon

6-4 7-6(4)#230Sumit Nagal

6-4 6-3#790Ilya Snitari

7-5 2-6 6-1#112Chak Lam Coleman Wong

6-3 7-6(1)#240James McCabe

6-4 4-6 7-6(4)#144Hugo Dellien

6-3 6-4#158Zhizhen Zhang

Jan Kumstat

9W 6L

1-6 7-6(1) 6-2#361Mathys Erhard

6-4 6-2#888Yuichiro Inui

7-5 6-4#189Tom Gentzsch

6-1 6-1#482Thijs Boogaard

6-7(5) 6-4 6-4#285Florian Broska

6-3 6-1#218Henri Squire

6-3 6-3#449Mateus Alves

7-6(2) 6-4#661Leo Raquillet

7-6(5) 6-2#710Pavel Lagutin

6-1 1-6 6-3—Duje Markovina

6-3 6-2#622Kai Wehnelt

6-4 7-6(3)#432Corentin Denolly

3-6 7-6(4) 6-2#389Georgii Kravchenko

7-6(5) 6-4#321Marvin Moeller

6-2 6-1#861Jakub Filip

Stat Battle

Last 15 match performance, compared side by side.

ZKZdenek KolarKolar

Last 15

2–7

9 core stats · 0 even

Jan KumstatKumstatJK

Jan Kumstat carries the stronger recent form — Zdenek Kolar's route runs through serve.

Serve · 1–4

1st Serve In65.4%+9.0pp56.4%

1st Serve Won63.2%+11.8pp75.0%

2nd Serve Won49.9%+5.8pp55.7%

Aces / Match1.7+6.48.1

Double Faults / Match3.71.0 fewer2.7

Return · 1–0

Return Pts Won41.4%+3.4pp38.0%

Pressure · 0–2

Break Pts Converted40.7%+7.9pp48.6%

Break Pts Saved50.0%+6.3pp56.3%

Points · 0–1

Total Pts Won49.6%+2.6pp52.2%

Serve · 1–4

65.4%1st Serve In+9.0pp56.4%

63.2%1st Serve Won+11.8pp75.0%

49.9%2nd Serve Won+5.8pp55.7%

1.7Aces / Match+6.48.1

3.7Double Faults / Match1.0 fewer2.7

Return · 1–0

41.4%Return Pts Won+3.4pp38.0%

Pressure · 0–2

40.7%Break Pts Converted+7.9pp48.6%

50.0%Break Pts Saved+6.3pp56.3%

Points · 0–1

49.6%Total Pts Won+2.6pp52.2%