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Predictions graded

Marta Kostyuk #15Ukraine2Iga Swiatek #3Poland0

Sets 7-5 · 6-1Sun 31 May 2026, 09:03 Predictions gradedFourth RoundClay

Predictions3–633%

Edges2–433%

Player Profiles

Ranking advantageIga Swiatek · 12 places

Marta Kostyuk

Ukraine

Reached a career-high No. 15 during the 2026 clay swing. WTA lists Sandra Zaniewska as her coach, and official tour coverage says she arrived in Paris unbeaten on clay in 2026 after titles in Rouen and Madrid.

Current ranking: #15
Peak ranking: #15
Current age: 23
Preferred surface: Clay
Hand: Right handed
Height: 175 cm

Iga Swiatek

Poland

Former world No. 1 and four-time Roland Garros champion. WTA lists Francisco Roig as her coach, and current Paris coverage says her forehand shape and decision-making have improved during this run.

Current ranking: #3
Peak ranking: #1
Current age: 24
Preferred surface: Clay
Hand: Right handed
Height: 176 cm

Quick Take

Pre-match view

Context last updated 30 May 2026, 08:21 · Europe/Bucharest

Iga Swiatek's 3-0 H2H dominance, elite Roland Garros record (43-3), and superior serve/return stats make her a strong favorite over the in-form but fatigued Marta Kostyuk.

Best betting value lies in under 20.5 total games (edge: 5.6pts) and Swiatek 2-0 in set betting (edge: 5pts), as Swiatek's efficiency and Kostyuk's physical toll point to a straight-set, low-game match. Avoid the moneyline due to accurate pricing and the game handicap due to Swiatek's inconsistent recent margins.

Context

Kostyuk has won 15 straight clay matches in 2026, including wins over top-10 players Mirra Andreeva and Jessica Pegula.
- Swiatek's career clay win rate is 88.7% (157-20), and she is 43-3 at Roland Garros.
- Swiatek leads the head-to-head 3-0, all in straight sets, with an average of just 3.7 games lost per match.
- Kostyuk's career clay win rate is 69.1% (94-42), significantly lower than Swiatek's.
Kostyuk's third-round win over Volynets lasted 2h43 and went to three sets.
- Swiatek has won all three matches in Paris in straight sets, with an average match time under 1h30.
- Kostyuk has played three three-setters in her last five matches, indicating potential fatigue.
- No current injury or illness reported for Kostyuk, but the physical toll is notable.
Swiatek changed coaches after a loss to Magda Linette in Miami in March 2026, hiring Francisco Roig.
- WTA and Roland Garros coverage on May 29 noted her decision-making and forehand shape looked sharper.
- Swiatek has won all three matches in Paris in straight sets, losing only 16 games total.
- Her break point conversion rate is 50.2%, and she wins 68.4% of first-serve points.

BetBugs edges

Compare BetBugs' chances with the market's.

Positive edges · 5

BetBugs probabilities

How likely BetBugs thought each outcome was.

Result0 of 1 landed

Signal quality High · Uncertainty band Strong lean · Market price 1.36
The read
Swiatek's dominant H2H, elite clay pedigree, and superior serve/return stats give her a clear edge despite Kostyuk's hot form.
- Swiatek leads H2H 3-0, all in straight sets, including a 6-2 6-2 win on hard in 2024 and a 6-3 6-4 win on clay in 2021.
- Swiatek's career clay win rate is 157-20 (88.7%), with a 43-3 record at Roland Garros.
- Kostyuk is on a 15-match clay win streak in 2026, but her career clay win rate is 94-42 (69.1%).
- Swiatek's first-set win conversion is 94%, and her break point save rate is 57.6% vs. Kostyuk's 55.3%.
BetBugs · Match WinnerlostIga SwiatekEstimated chance72%

Games1 of 3 landed

Signal quality Medium · Uncertainty band Lean · Not priced
The read
Swiatek's ability to dominate early, combined with Kostyuk's occasional slow starts, suggests a first set under 8.5 games.
- Average games in first set of Swiatek's last 5 matches: 7.6 (10, 8, 7, 10, 7).
- Average games in first set of Kostyuk's last 5 matches: 8.4 (10, 13, 8, 9, 8).
- H2H first-set scores: 6-2, 6-2, 6-3.
- Swiatek's first-serve win rate is 68.4%, and she breaks serve in 50.2% of opportunities.
BetBugs · Set 1 Total GameslostUnder 8.5Estimated chance60%
Signal quality Medium · Uncertainty band Lean · Market price 1.91
The read
Swiatek's efficient wins and Kostyuk's potential fatigue from a long previous match point to a relatively short match under 20.5 games.
- Average total games in Swiatek's last 5 wins: 17.2 (12, 12, 12, 12, 12).
- Average total games in Kostyuk's last 5 wins: 19.4 (19, 31, 17, 21, 22).
- H2H matches averaged 17.3 total games (14, 15, 23).
- Swiatek's return points won rate is 48%, and she converts break points at 50.2%.
BetBugs · Total GameswonUnder 20.5Estimated chance58%
Signal quality Medium · Uncertainty band Slight lean · Market price 1.91
The read
Swiatek's consistent ability to win by wide margins, especially on clay, supports a -4.5 game handicap.
- Swiatek's average game margin in her last 5 wins: +7.6 (8, 7, 9, 9, 5).
- Kostyuk's average game margin in her last 5 wins: +4.8 (5, 5, 7, 5, 4).
- H2H game margins: +8, +9, +4 (average +7.0).
- Swiatek's return points won rate is 48% vs. Kostyuk's 46%.
BetBugs · Game HandicaplostIga Swiatek -4.5Estimated chance55%

Sets1 of 4 landed

Signal quality High · Uncertainty band Strong lean · Not priced
The read
Swiatek's exceptional first-set record and H2H dominance make her a strong favorite to win the opening set.
- Swiatek's career first-set win rate is 94%, and she won the first set in all three H2H meetings.
- Kostyuk's first-set win rate in her last 15 matches is 80% (12/15), but she lost the first set in her only previous clay meeting with Swiatek.
- Swiatek has won the first set in 13 of her last 15 completed matches.
- Swiatek's win on first serve rate is 68.4% vs. Kostyuk's 64.7%.
BetBugs · Set 1 WinnerlostIga SwiatekEstimated chance75%
Signal quality Medium · Uncertainty band Strong lean · Not priced
The read
Swiatek's superior second-serve and break-point conversion rates make her likely to win the second set if the match extends.
- Swiatek has won the second set in 12 of her last 15 completed matches.
- Kostyuk has won the second set in 11 of her last 15 matches, but lost it in her only clay meeting with Swiatek.
- Swiatek's win on second serve rate is 51.5% vs. Kostyuk's 44.2%.
- Swiatek's break point conversion rate is 50.2% vs. Kostyuk's 48%.
BetBugs · Set 2 WinnerlostIga SwiatekEstimated chance70%
Signal quality Medium · Uncertainty band Slight lean · Market price 2.00
The read
Swiatek's historical dominance in this matchup and her strong first-set record suggest a straight-set win is likely.
- All three H2H matches were straight-set wins for Swiatek.
- Swiatek has won 8 of her last 10 completed matches in straight sets.
- Kostyuk has dropped a set in 3 of her last 5 matches, including a three-setter in the previous round.
- Swiatek's first-set win rate is 94%, and she has not lost a set to Kostyuk in their career meetings.
BetBugs · Set BettinglostIga Swiatek 2-0Estimated chance55%
Signal quality Medium · Uncertainty band Slight lean · Market price 1.91
The read
Swiatek's tendency to win in straight sets, especially against Kostyuk, points to under 2.5 total sets.
- Swiatek has won 8 of her last 10 completed matches in straight sets.
- Kostyuk has gone to three sets in 3 of her last 5 matches.
- H2H: all three matches were straight-set wins for Swiatek.
- Swiatek's first-set win rate is 94%, and she has a 65% deciding-set win rate.
BetBugs · Total SetswonUnder 2.5Estimated chance55%

Match stats1 of 1 landed

Signal quality Medium · Uncertainty band Strong lean · Not priced
The read
Swiatek's ability to win sets comfortably and the lack of tiebreaks in their H2H history suggest a tiebreak is unlikely.
- Swiatek has played only 1 tiebreak in her last 15 matches.
- Kostyuk has played 2 tiebreaks in her last 15 matches.
- In H2H, no tiebreaks have occurred in 3 matches.
- Swiatek's first-set dominance (94% win rate) reduces the likelihood of tight sets.
BetBugs · Tiebreak in MatchwonNoEstimated chance65%
Signal quality Medium · Uncertainty band Lean · Not priced
The read
Both players have moderate ace rates, and their combined average in recent matches is well below 6.5.
- Swiatek averages 3.9 aces per match, Kostyuk also 3.9.
- In their three H2H matches, total aces were 7 (Swiatek 6, Kostyuk 1).
- Swiatek's last 5 matches: aces per match 2, 3, 4, 2, 3 (avg 2.8).
- Kostyuk's last 5 matches: aces per match 2, 4, 3, 2, 3 (avg 2.8).
BetBugs · Total AcesUnder 6.5Estimated chance62%

Markets to Avoid

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

Pre-match flagged 8 avoid-market areas; caution remains warranted in high-variance spots.

Head-to-Head

0-3 (3 meetings)

L6-2 6-2Marta Kostyuk#15vIga Swiatek#3Aug 16, 2024

L6-2 6-1Marta Kostyuk#15vIga Swiatek#3Mar 15, 2024

L6-3 6-4Marta Kostyuk#15vIga Swiatek#3Jun 7, 2021

Iga Swiatek dominates (3 meetings)3 total meetings

Marta Kostyuk

15W 0L

6-4 6-3#82Viktorija Golubic

6-7(4) 6-3 6-3#108Katie Volynets

6-2 6-3#88Oksana Selekhmeteva

6-3 7-5#8Mirra Andreeva

6-2 1-6 6-1#30Anastasia Potapova

7-6(1) 6-0#12Linda Noskova

6-2 6-3#63Caty McNally

6-1 6-4#5Jessica Pegula

6-1 6-3#76Yulia Putintseva

6-3 6-4#142Veronika Podrez

6-3 6-0#54Tatjana Maria

6-0 6-7(4) 6-3#29Ann Li

2-6 6-2 6-1#63Caty McNally

6-1 6-4#92Diane Parry

6-4 6-0#73Magda Linette

Iga Swiatek

10W 5L

6-4 6-4#73Magda Linette

6-2 6-3#35Sara Bejlek

6-1 6-2#136Emerson Jones

6-4 2-6 6-2#7Elina Svitolina

6-1 6-2#5Jessica Pegula

6-2 6-1#16Naomi Osaka

6-1 6-0#38Elisabetta Cocciaretto

6-1 6-7(5) 6-3#63Caty McNally

7-6(4) 2-6 3-0 ret.#29Ann Li

6-1 6-2#93Daria Snigur

3-6 6-4 6-3#8Mirra Andreeva

6-2 6-3#47Laura Siegemund

1-6 7-5 6-3#73Magda Linette

6-2 4-6 6-4#7Elina Svitolina

6-2 6-0#10Karolina Muchova

Marta Kostyuk #15Ukraine2Iga Swiatek #3Poland0

Player Profiles

Marta Kostyuk

Iga Swiatek

Quick Take

Context

BetBugs edges

Swiatek, I 2-0

Under 20.5

Iga Swiatek 2-0

Iga Swiatek -4.5

Under 2.5

Iga Swiatek

BetBugs probabilities

Result0 of 1 landed

Games1 of 3 landed

Sets1 of 4 landed

Match stats1 of 1 landed

Markets to Avoid

Iga Swiatek @ 1.36

Kostyuk, M 2-0 @ 5.50

Kostyuk, M 2-1 @ 6.00

Head-to-Head

Marta Kostyuk

Iga Swiatek