Tennis · Oct 17, 2:45 AM PDT

Laura Samson vs Tamara Zidansek

79.5%Tamara Zidansek

LOCKED Oct 17, 2:01 AM PDT

4/4 independent models select Tamara Zidansek; all four oriented probabilities average 79.5%.

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FORECASTTamara Zidansek

Estimated outcome probability. A likely winner can still be overpriced.

RELIABILITY4/4 model reports

19 reported evidence limits. Agreement alone does not establish accuracy.

MARKET VALUENot established

A probability difference alone does not account for forecast error, fees, spread, or available liquidity.

Why the models lean this way

These are reasons recorded by the models. They are not independently verified facts or measured causes of a probability change.

Claude: Large nominal ranking gap: Zidansek 6 vs Samson 128
Grok: Zidansek current rank 6 vs Samson rank 128
Gemini: Tamara Zidansek is ranked No. 6 in the world.
GPT: Tamara Zidansek current rank: 6

Read all four model reports

Claude · Tamara Zidansek · 68.0%

The only usable discriminators are ranking and season record. Zidansek is listed at rank 6 versus Samson's 128 (down from 113), a gap that normally implies a clear favorite. However, Zidansek's supplied 26-18 season record is modest for a top-10 player, which tempers confidence that the rank figure reflects true current standing; Samson's 578 ranking points are also consistent with a developing player rather than a pushover, and she has already reached the same semifinal. Surface-specific form, injuries, head-to-head history, travel/scheduling load, and market odds are all unavailable in this evidence package, so the estimate is deliberately pulled toward a moderate favorite level rather than the lopsided number a raw 6-vs-128 gap would suggest.

anthropic/claude-opus-5 · Oct 16, 9:35 PM PDT

Grok · Tamara Zidansek · 82.0%

Tamara Zidansek holds a vastly superior current rank of 6 compared to Laura Samson's rank of 128, along with a documented 26-18 season singles record. Samson has no win-loss record supplied. This ranking gap supports a strong edge for Zidansek in a WTA semifinal. Surface form, injuries, head-to-head, travel, and market odds are unavailable as they are not supplied in the evidence package.

xai/grok-4.3 · Oct 16, 9:35 PM PDT

Gemini · Tamara Zidansek · 85.0%

Tamara Zidansek holds a massive ranking advantage, sitting at world No. 6 compared to Laura Samson's No. 128. Zidansek also has a solid 26-18 win-loss record for the season, whereas Samson's record is unavailable. The significant gap in rankings strongly favors Zidansek, though the lack of surface-specific form and head-to-head data limits absolute certainty.

google/gemini-3.1-pro-preview · Oct 16, 9:35 PM PDT

GPT · Tamara Zidansek · 83.0%

Using only the supplied evidence, Tamara Zidansek is the stronger side. The package gives Zidansek a current rank of 6 and a 26-18 season singles record, while Laura Samson is ranked 128. A ranking gap of this size strongly favors Zidansek in a match-winner forecast. Samson’s season win-loss record is not supplied, so the estimate must lean heavily on the ranking comparison plus the fact that Zidansek has a solid positive season record. Because this is a semifinal between two players who have already advanced deep in the event, and because Samson’s missing season record limits precision, I stop short of an extreme probability. Surface form, injuries, head-to-head, travel, and market odds are unavailable in the evidence and cannot be used.

openai/gpt-5.4 · Oct 16, 9:35 PM PDT

What remains uncertain

No surface-specific (hard/clay) form data
No injury or fitness information
No head-to-head record
No travel or scheduling/rest information
No market odds or implied probabilities
Apparent tension between Zidansek's rank 6 and her 26-18 record; no ranking points supplied for her
Surface-specific form unavailable
Injuries not supplied

What to watch next

Official result recorded. Review the original forecast and sources below.

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What changed before the lock

Oct 17, 2:01 AM PDT · final lockProbability unchanged
The pre-event probability state was locked atomically and is immutable.
Record hash
7c86644022195899c88922b80ede69917d8a65b0e1db25d9887ad8a5586ae3a6
Oct 16, 9:35 PM PDT · house adjudication completedFirst recorded forecast
First prospective probability state captured for this source and competition.
Record hash
a4c45414ccf35c230f752e5bc596fb94335fd45d5c650fcbdb5387c572071693

Reasons are shown as they were recorded. The ledger does not establish that a specific fact caused a probability change.

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Available source context

site.api.espn.com ↗sports.core.api.espn.com ↗sports.core.api.espn.com ↗sports.core.api.espn.com ↗sports.core.api.espn.com ↗sports.core.api.espn.com ↗

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Recorded outcome: (2) Laura Samson (CZE) bt (6) Tamara Zidansek (SLO) 6-1 1-6 6-3

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