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Predictions graded

Mary Stoiana #114United States0Katerina Siniakova #86Czechia2

Sets 1-6 · 2-6Fri 23 Oct 2026, 06:20 Predictions gradedQuarter-FinalHard

Predictions6–367%

Edges1–420%

Player Profiles

Ranking advantageKaterina Siniakova · 28 places

Mary Stoiana

United States

Limited reliable public profile information was found. Use the structured ranking and form data as the main current context.

Current ranking: #114
Peak ranking: —
Current age: 23
Preferred surface: I.hard
Hand: —
Height: —

Katerina Siniakova

Czechia

Reached a career-high singles ranking of No. 27 in June 2024. Current context is dominated by the knee-related break reported on July 27, 2026.

Current ranking: #86
Peak ranking: #27 · 2024
Current age: 30
Preferred surface: Carpet
Hand: Right handed
Height: 174 cm

Quick Take

Pre-match view

Context last updated 22 Oct 2026, 20:48 · Europe/Bucharest

Stoiana has already played four matches in six days to Siniakova's two, yet she has won 11 of 15 on hard.

Siniakova, the doubles No. 1 ranked 86 in singles, looks the likelier winner, but 1.4 asks too much of her 6-7 season; Stoiana at 2.9 for the match, 2.6 for the first set, 2.6 for the second and over 21.5 games at 2.0 are where the odds offer something.

Context

The concrete anchor is her college record: 138-20 at Texas A&M, where she never lost a home match, and she has carried that match hardness into a week of four wins in six days. The limitation is the opposition — two of those wins came in qualifying against players outside the top 400, so the meaningful scalps are No. 62 Oleksandra Oliynykova and No. 121 Moyuka Uchijima. Siniakova, at No. 86, is the first opponent Stoiana has faced this week ranked inside the top 90, which makes this the clearest test of where her level actually sits.
- Beat Moyuka Uchijima 6-2 2-6 6-3 for a second career WTA quarterfinal, the first having come in São Paulo in September.
- Career-high live ranking of No. 112 after the win; seeded No. 114 at entry.
- First three Osaka wins in straight sets: 6-3 7-6(1) over Rinko Matsuda in qualifying, 6-4 7-5 over Sayaka Ishii in the qualifying final, 6-2 6-3 over No. 62 Oleksandra Oliynykova in the first round.
ConfirmedSources checked 22 Oct 2026, 20:46 · Europe/Bucharest
Four consecutive wins over Linette, the last two by 6-4 6-3 in Beijing and 6-4 6-1 in Osaka three weeks apart, are the clearest evidence of her singles level in months, and a first quarterfinal of the season at the end of October is the milestone that makes it notable. The limitation is the draw: Linette, at No. 77, is the highest-ranked player she has beaten in this run, and her two most recent defeats came against Elina Svitolina and Liudmila Samsonova. Doubles No. 1 status explains her net game and court craft but is not itself evidence of singles form.
- First singles quarterfinal of the 2026 season, secured with a 6-4 6-1 win over Magda Linette .
- Fourth straight win over Linette, following 6-4 6-3 in Beijing roughly three weeks earlier.
- Described in Czech reporting as the doubles world No. 1 while competing unseeded in the Osaka singles draw.
ConfirmedSources checked 22 Oct 2026, 20:46 · Europe/Bucharest
The asymmetry is the point: two qualifying rounds plus a three-set second round, against an opponent playing her third match of the week. Stoiana has already absorbed four matches in six days without retiring and won three of them in straight sets, so the load has been spread unevenly toward her. Whether that shows up in a fourth set-deciding situation is uncertain, and Siniakova's own week was not empty — her first round went to a third set before her opponent retired at 4-0 — so this is a workload note rather than a fitness finding.
- Qualifying wins (6-3 7-6(1) over Rinko Matsuda) and (6-4 7-5 over Sayaka Ishii).
- Three-set second round : 6-2 2-6 6-3 over Moyuka Uchijima.
- Siniakova's first Osaka match was on 20 October, followed by a 6-4 6-1 second round .
ConfirmedSources checked 22 Oct 2026, 20:46 · Europe/Bucharest
Siniakova has been notably steadier in second sets than in openers across her recent hard-court matches.
Siniakova's set splits are 4-4 in openers and 6-2 in second sets over those eight matches, with three 2-0 wins and four that ran the full distance. That mix makes a clean two-set afternoon plausible without being the pattern her own record describes. Against an opponent who has won 11 of 15 first sets on hard, the opener is where Siniakova has been least secure, which pushes the match toward a longer shape.
- Siniakova's eight completed hard-court matches from 16 August to 22 October 2026 produced three 2-0 wins, one 2-1 win, three 1-2 losses and one 0-2 loss.
- Her total-sets average across that sample is 2.5, with one of the eight matches containing a tiebreak.
- She won 6 of 8 second sets but split first sets 4-4.

BetBugs edges

Compare BetBugs' chances with the market's.

Positive edges · 4

BetBugs probabilities

How likely BetBugs thought each outcome was.

Result1 of 1 landed

Signal quality Medium · Uncertainty band Slight lean · Not priced
The read
Siniakova has the ranking edge, is fresher, and showed sharp form against Linette.
- Siniakova is ranked 86, ahead of Stoiana at 114.
- She beat Magda Linette 6-4 6-1 in the last round.
- Stoiana is playing her fifth match in seven days; Siniakova is on her third match in Osaka.
BetBugs · Match WinnerwonKaterina SiniakovaEstimated chance55%

Games1 of 3 landed

Signal quality Medium · Uncertainty band Slight lean · Market price 2.00
The read
Both players' recent hard-court matches average just above 22 games, with several three-set contests.
- Stoiana's hard-court matches average 22.1 total games.
- Siniakova's hard-court matches average 21.9 total games.
- Seven of their combined 12 recent completed hard matches went over 21.5 games.
BetBugs · Total GameslostOver 21.5Estimated chance54%
Signal quality Medium · Uncertainty band Slight lean · Not priced
The read
The combined first-set average sits just below 9.5 games.
- Stoiana's first sets average 9.7 total games on hard.
- Siniakova's first sets average 8.9 total games on hard.
- The combined first-set average is about 9.4 games.
BetBugs · Set 1 Total GameswonUnder 9.5Estimated chance53%
Signal quality Medium · Uncertainty band Slight lean · Not priced
The read
Second sets have tended to run slightly longer than 9.5 games.
- Stoiana's second sets average 9.9 total games on hard.
- Siniakova's second sets average 9.3 total games on hard.
- The combined second-set average is about 9.6 games.
BetBugs · Set 2 Total GameslostOver 9.5Estimated chance52%

Sets2 of 3 landed

Signal quality Medium · Uncertainty band Lean · Market price 1.44
The read
Stoiana has often won in straight sets, and Siniakova's wins also tend to be short.
- Stoiana's hard-court scorelines include eight 2-0 wins in 15 matches.
- Siniakova has three 2-0 wins in eight hard-court matches.
- Stoiana's set evidence shows total sets average 2.27.
BetBugs · Total SetswonUnder 2.5Estimated chance59%
Signal quality Medium · Uncertainty band Slight lean · Not priced
The read
Siniakova has been notably strong in second sets, often after losing the opener.
- Siniakova has won 6 of 8 second sets on hard.
- She won the second set in five of her last six completed matches.
- Stoiana has won 9 of 15 second sets on hard.
BetBugs · Set 2 WinnerwonKaterina SiniakovaEstimated chance57%
Signal quality Medium · Uncertainty band Near coin-flip · Market price 2.60
The read
Stoiana has started strongly, winning most of her first sets.
- Stoiana has won 11 of 15 first sets on hard.
- Siniakova has split first sets 4-4 on hard in her last eight matches.
- Stoiana won the opening set in five of her last six completed matches.
BetBugs · Set 1 WinnerlostMary StoianaEstimated chance51%

Match stats1 of 1 landed

Signal quality Low · Uncertainty band Strong lean · Not priced
The read
Most of their recent sets have been decided without a tiebreak.
- Stoiana has had a tiebreak in 4 of 15 hard-court matches.
- Siniakova has had a tiebreak in 1 of 8 hard-court matches.
- Their combined recent hard-court sample has five matches with a tiebreak.
BetBugs · Tiebreak in MatchwonNoEstimated chance70%

Previous match context available

Mary Stoiana

11W 4L

6-2 2-6 6-3#121Moyuka Uchijima 6-2 6-3#62Oleksandra Oliynykova 6-4 7-5#589Sayaka Ishii 6-3 7-6(1)#434Rinko Matsuda

7-5 7-5#228Julieta Pareja

6-3 6-4#287Hanna Chang

6-4 6-2#61Paula Badosa Gibert

7-6(5) 6-1#112Dominika Salkova

6-3 7-5#95Claire Liu

4-6 7-6(7) 6-3#141Julia Riera

6-3 6-2#150Jazmin Ortenzi

6-1 6-2#20Alexandra Eala

6-3 4-6 6-4#173Yue Yuan

6-7(5) 6-3 6-3#195Katie Swan

6-4 6-3#215Harmony Tan

Katerina Siniakova

7W 8L

6-4 6-1#77Magda Linette 6-4 0-6 4-0 ret.#37Peyton Stearns

6-1 5-7 6-2#43Liudmila Samsonova

1-6 6-4 6-2#6Elina Svitolina

6-4 6-3#77Magda Linette

6-2 5-7 6-1#19Naomi Osaka

6-3 6-2#65Elisabetta Cocciaretto

6-1 6-3#21Madison Keys

6-7(5) 6-1 6-1#96Jessica Bouzas Maneiro

6-7(1) 6-0 5-2 ret.#67Kamilla Rakhimova

6-2 6-4#29Nikola Bartunkova

6-4 6-4#22Qinwen Zheng

6-3 7-5#43Liudmila Samsonova

6-2 6-4#4Jessica Pegula

6-2 6-4#165Rebeka Masarova

Stat Battle

Last 15 match performance, compared side by side.

MSMary StoianaStoiana

Last 15

6–3

9 core stats · 0 even

Katerina SiniakovaSiniakovaKS

Mary Stoiana carries the stronger recent form — Katerina Siniakova's route runs through serve.

Serve · 3–2

1st Serve In60.7%+2.8pp57.9%

1st Serve Won60.2%+3.8pp64.0%

2nd Serve Won49.2%+2.8pp46.4%

Aces / Match1.1+1.52.6

Double Faults / Match3.91.8 fewer5.7

Return · 1–0

Return Pts Won47.8%+5.8pp42.0%

Pressure · 1–1

Break Pts Converted48.4%+4.3pp44.1%

Break Pts Saved53.6%+1.8pp55.4%

Points · 1–0

Total Pts Won51.8%+2.5pp49.3%

Serve · 3–2

60.7%1st Serve In+2.8pp57.9%

60.2%1st Serve Won+3.8pp64.0%

49.2%2nd Serve Won+2.8pp46.4%

1.1Aces / Match+1.52.6

3.9Double Faults / Match1.8 fewer5.7

Return · 1–0

47.8%Return Pts Won+5.8pp42.0%

Pressure · 1–1

48.4%Break Pts Converted+4.3pp44.1%

53.6%Break Pts Saved+1.8pp55.4%

Points · 1–0

51.8%Total Pts Won+2.5pp49.3%

Mary Stoiana

Katerina Siniakova

Quick Take

Context

BetBugs edges

Over 21.5

Mary Stoiana

Mary Stoiana

Mary Stoiana

Under 2.5

Result1 of 1 landed

Games1 of 3 landed

Sets2 of 3 landed

Match stats1 of 1 landed

Mary Stoiana

Katerina Siniakova

Stat Battle