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Predictions graded

Nikola Bartunkova #42Czechia1Elise Mertens #23Belgium2

Sets 6-1 · 4-6 · 2-6Sat 29 Aug 2026, 01:30 Predictions gradedSemi-FinalHard

Predictions3–443%

Edges1–150%

Player Profiles

Ranking advantageElise Mertens · 19 places

Nikola Bartunkova

Czechia

Bartunkova is a 20-year-old Czech right-hander. She reached a recorded career-high No. 41 on July 27, 2026.

Current ranking: #42
Peak ranking: #41 · 2026
Current age: 20
Preferred surface: —
Hand: Right handed
Height: —

Elise Mertens

Belgium

Reached a career-high No. 12 on 26 November 2018. Her major singles results include the 2018 Australian Open semifinal and the 2026 Wimbledon quarterfinal.

Current ranking: #23
Peak ranking: #12 · 2018
Current age: 30
Preferred surface: Hard
Hand: Right handed
Height: 179 cm

Quick Take

Pre-match view

Context last updated 28 Aug 2026, 15:12 · Europe/Bucharest

Bartunkova's superior recent form and hard-court record give her a slight edge over Mertens, making her a value bet at 2.20.

The match is likely to be competitive, but a straight-set win for Bartunkova is more probable than a three-setter. Avoid the over 2.5 sets and Bartunkova 2-1 set betting markets.

Context

Bartunkova, 20, is ranked No. 38 and has been steadily rising, with a 17-8 hard-court record in 2026.
Her recent hard-court results include wins over top-100 opponents Ruzic and Vidmanova, and she has won three consecutive matches in Monterrey. Mertens has also won her last two matches here, but her hard-court sample is smaller and includes a loss to Parry. Bartunkova's 70% win rate on hard courts in her last 10 matches is a strong indicator of current comfort on this surface.
- Bartunkova is 7-3 on hard courts in her last 10 matches (70% win rate).
- Mertens is 3-2 on hard courts in her last 5 matches (60% win rate).
- Bartunkova has won three straight matches in Monterrey, including a win over No. 81 Ruzic.
Bartunkova has played two long three-set matches in a row to reach this semifinal, while Mertens had a bye and a quick quarterfinal.
Bartunkova has spent over five and a half hours on court in her last two matches, compared with 90 minutes for Mertens in the quarterfinal. That extra workload could affect Bartunkova's recovery and energy in a best-of-three semifinal, though she has had a day off before this match.
- Bartunkova's wins over En-shuo Liang and Darja Vidmanova were consecutive three-set matches of 2 hours 43 minutes and 2 hours 44 minutes.
- Mertens was the No. 2 seed in a draw where the top four seeds received byes, then beat Yuliia Starodubtseva in 90 minutes.
ConfirmedSources checked 28 Aug 2026, 23:49 · Europe/BucharestNikola Bartůňková v En-šuo Liang match reportm.onlajny.com · 26 Aug 2026Nikola Bartunkova gets through all-Czech quarterfinal in Monterreyfieldlevelmedia.com · 28 Aug 2026Monterrey: Dates, who's playing, prize money and everything to knowwww.wtatennis.com · 19 Aug 2026La belga Mertens avanza a la semifinal en el Abierto de Monterreywww.tycsports.com · 28 Aug 2026
Mertens, 30, is a former top-20 player known for her consistency, but her recent hard-court stats show some decline.
In her last five hard-court matches, Mertens has a first-serve percentage of 54.3% and wins 41.1% of return points. Bartunkova, in her last 10 hard-court matches, has a first-serve percentage of 50.2% but wins 43.4% of return points. Mertens' lower return points won could be a factor if Bartunkova's serve holds up.
- Mertens' hard-court first-serve percentage: 54.3% (last 5 matches).
- Mertens' hard-court return points won: 41.1% (last 5 matches).
- Bartunkova's hard-court return points won: 43.4% (last 10 matches).
The two players have met twice in 2026, with each winning on a different surface.
Bartunkova won 6-1 6-4 on grass in June, while Mertens won 6-0 6-4 on hard court in January. This match is on hard court, which favors Mertens based on their previous meeting, but Bartunkova's current hard-court form is stronger than it was in January.
- Bartunkova won 6-1 6-4 on grass (June 2026).
- Mertens won 6-0 6-4 on hard court (January 2026).
- This match is on hard court.

BetBugs edges

Compare BetBugs' chances with the market's.

Positive edges · 1

Other edges · 1

The published chance does not exceed the market's implied chance.

Total GameswonUncertainty band: Lean

Over 21.5

1.65fair 1.67

BetBugs 60% · Market 60.6%

0.0ppshort

Both players have competitive recent matches, and Bartunkova's longer average match duration suggests a higher total games count.

BetBugs probabilities

How likely BetBugs thought each outcome was.

Result0 of 1 landed

Signal quality Medium · Uncertainty band Lean · Market price 2.20
The read
Bartunkova's stronger recent form and hard-court record, plus her most recent H2H win, give her a slight edge despite Mertens' higher ranking.
- Last 15 overall record: Bartunkova 10-5 (66.7%) vs Mertens 9-6 (60%)
- Last 15 hard-court record: Bartunkova 7-3 (70%) vs Mertens 3-2 (60%, only 5 matches)
- H2H 2026: 1-1, Bartunkova won most recent meeting 6-1 6-4 on grass
- Bartunkova ranking 38, Mertens ranking 24
BetBugs · Match WinnerlostNikola BartunkovaEstimated chance58%

Games1 of 2 landed

Signal quality Medium · Uncertainty band Lean · Market price 1.65
The read
Both players have competitive recent matches, and Bartunkova's longer average match duration suggests a higher total games count.
- Bartunkova last 15 average match duration: 128.8 minutes
- Mertens last 15 average match duration: 102.3 minutes
- Bartunkova last 15 hard-court average games per match: 26.4
- Mertens last 15 hard-court average games per match: 22.2
BetBugs · Total GameswonOver 21.5Estimated chance60%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
The first set is likely to be competitive, with both players having strong first-serve numbers, leading to a higher game count.
- Bartunkova last 15 hard-court first-serve points won: 68.8%
- Mertens last 15 hard-court first-serve points won: 71.7%
- Both players have similar first-set win conversion rates (87%)
BetBugs · Set 1 Total GameslostOver 9.5Estimated chance55%

Sets1 of 1 landed

Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Bartunkova's recent hard-court form and strong first-set conversion rate support a slight edge in the opening set.
- Bartunkova first-set win conversion career: 87%
- Mertens first-set win conversion career: 87%
- Bartunkova last 15 hard-court first-serve points won: 68.8%
- Mertens last 15 hard-court first-serve points won: 71.7%
BetBugs · Set 1 WinnerwonNikola BartunkovaEstimated chance55%

Match stats0 of 0 landed

Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Both players average over 5 aces per match, making over 8.5 total aces a reasonable expectation.
- Bartunkova last 15 aces per match: 5.7
- Mertens last 15 aces per match: 5.0
- Combined average aces per match: 10.7
BetBugs · Total Acesnot gradableOver 8.5Estimated chance52%
Signal quality Low · Uncertainty band Near coin-flip · Not priced
The read
Both players have relatively high double fault rates, making over 9.5 total double faults a plausible outcome.
- Bartunkova last 15 double faults per match: 4.7
- Mertens last 15 double faults per match: 5.6
- Combined average double faults per match: 10.3
BetBugs · Total Double Faultsnot gradableOver 9.5Estimated chance50%

Prediction history

Nikola Bartunkova has been highly reliable when projected to win

Nikola Bartunkova has fulfilled 6 of 8 recent win projections. Her average estimated probability was 61.8%, with an expected 4.9 fulfilled predictions, so she has outperformed expectation. The current probability of 58% sits within her historical range of 58-72%.

Recent evidence for Nikola Bartunkova8 matches

Date / competitionMatch resultPredictedActualResult

21 Jul·WTA Prague

#43Nikola Bartunkova2-1#120Yue Yuan

BetBugsNikola Bartunkova to win·72%

Matched

21 Jul 2026

WTA Prague

#43Nikola Bartunkova2-1#120Yue Yuan

Nikola Bartunkova to win

72%probability

Nikola Bartunkova won

Matched

29 Jun·WTA Wimbledon

#63Peyton Stearns1-2#46Nikola Bartunkova

BetBugsNikola Bartunkova to win·58%

Matched

29 Jun 2026

WTA Wimbledon

#63Peyton Stearns1-2#46Nikola Bartunkova

Nikola Bartunkova to win

58%probability

Nikola Bartunkova won

Matched

9 Jun·WTA 's-Hertogenbosch

#69Nikola Bartunkova1-2#99Hanne Vandewinkel

BetBugsNikola Bartunkova to win·62%

Missed

9 Jun 2026

WTA 's-Hertogenbosch

#69Nikola Bartunkova1-2#99Hanne Vandewinkel

Nikola Bartunkova to win

62%probability

Hanne Vandewinkel won

Missed

6 Jun·WTA Birmingham

#69Nikola Bartunkova2-0#120Ashlyn Krueger

BetBugsNikola Bartunkova to win·62%

Matched

6 Jun 2026

WTA Birmingham

#69Nikola Bartunkova2-0#120Ashlyn Krueger

Nikola Bartunkova to win

62%probability

Nikola Bartunkova won

Matched

5 Jun·WTA Birmingham

#69Nikola Bartunkova2-1#288Mika Stojsavljevic

BetBugsNikola Bartunkova to win·62%

Matched

5 Jun 2026

WTA Birmingham

#69Nikola Bartunkova2-1#288Mika Stojsavljevic

Nikola Bartunkova to win

62%probability

Nikola Bartunkova won

Matched

Head-to-Head

1-1 (2 meetings)

W6-1 6-4Nikola Bartunkova#38vElise Mertens#24Jun 17, 2026

L6-0 6-4Nikola Bartunkova#38vElise Mertens#24Jan 24, 2026

2 total meetings

Previous match context available

Nikola Bartunkova

10W 5L

6-4 6-7(3) 6-3#90Darja Vidmanova

6-7(4) 7-5 6-4#303En Shuo Liang

6-4 6-3#81Antonia Ruzic

7-6(5) 6-3#17Sorana Cirstea

4-6 6-4 6-3#108Alina Charaeva

3-6 6-0 6-4#10Amanda Anisimova

6-3 6-4#42Clara Tauson

7-5 6-4#183Bianca Vanessa Andreescu

7-6(4) 3-6 7-6(6)#72Lanlana Tararudee

3-6 6-4 6-1#138Yue Yuan

6-3 7-5#28Barbora Krejcikova

6-2 6-4#39Katerina Siniakova

6-4 3-6 7-5#54Peyton Stearns

2-6 7-6(2) 6-4#1Aryna Sabalenka

6-1 6-4#24Elise Mertens

Elise Mertens

9W 6L

6-1 6-4#74Yuliia Starodubtseva

6-1 4-6 6-3#76Panna Udvardy

2-6 6-2 6-2#50Diane Parry

6-1 6-2#13Naomi Osaka

3-6 6-4 6-4#70Anna Bondar

6-3 7-5#6Linda Noskova

6-4 6-4#26Marie Bouzkova

7-6(4) 6-1#2Elena Rybakina

2-6 6-3 6-0#92Maria Timofeeva

6-2 6-4#102Laura Siegemund

6-3 6-3#13Naomi Osaka

6-3 6-3#18Alexandra Eala

6-1 6-4#38Nikola Bartunkova

1-6 6-3 6-0#45Liudmila Samsonova

6-3 6-3#63Elena Gabriela Ruse

Stat Battle

Last 15 match performance, compared side by side.

NBNikola BartunkovaBartunkova

Last 15

5–4

9 core stats · 0 even

Elise MertensMertensEM

Nikola Bartunkova carries the stronger recent form — Elise Mertens's route runs through serve.

Serve · 3–2

1st Serve In50.8%+5.3pp56.1%

1st Serve Won69.8%+1.1pp70.9%

2nd Serve Won48.2%+6.0pp42.2%

Aces / Match5.7+0.75.0

Double Faults / Match4.70.9 fewer5.6

Return · 1–0

Return Pts Won43.8%+2.6pp41.2%

Pressure · 0–2

Break Pts Converted42.1%+2.8pp44.9%

Break Pts Saved60.0%+3.3pp63.3%

Points · 1–0

Total Pts Won51.4%+1.4pp50.0%

Serve · 3–2

50.8%1st Serve In+5.3pp56.1%

69.8%1st Serve Won+1.1pp70.9%

48.2%2nd Serve Won+6.0pp42.2%

5.7Aces / Match+0.75.0

4.7Double Faults / Match0.9 fewer5.6

Return · 1–0

43.8%Return Pts Won+2.6pp41.2%

Pressure · 0–2

42.1%Break Pts Converted+2.8pp44.9%

60.0%Break Pts Saved+3.3pp63.3%

Points · 1–0

51.4%Total Pts Won+1.4pp50.0%