What is the current probability for "Marta Kostyuk vs Sloane Stephens: Set 1 Winner"?

Current Kalshi odds for "Marta Kostyuk vs Sloane Stephens: Set 1 Winner": Marta Kostyuk 99%, Sloane Stephens 1% (top 2 of 2 outcomes), refreshed continuously.

When does this market resolve?

This event resolves on Sep 16, 2026.

How is the probability calculated?

pdata reads the latest market prices directly from kalshi's public API and normalizes them to a 0-100 probability scale. See https://pdata.world/methodology for details on per-platform conventions.

Where can I get this data programmatically?

The JSON endpoint is https://api.pdata.world/api/v1/events/kalshi/KXWTASETWINNER-26SEP02KOSSTE-1. An MCP server with 9 tools is available at https://api.pdata.world/mcp. Full agent guide: https://pdata.world/agents.md.

closedtrade on Kalshi

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event2 outcomes

Marta Kostyuk vs Sloane Stephens: Set 1 Winner

·Sports·ends Sep 16, 2026

vol cum

$67.1k

vol 24h

$66.9k

outcomes

ends

Sep 16, 2026

outcomesclick to inspect →

marketselected outcome

Marta Kostyuk

rank #1 · resolved: yes

99¢

▲ 18.0pp

24h change

vol cum

$43.8k

vol 24h

$43.6k

spread

1.00

ends

Sep 16, 2026

If Marta Kostyuk wins set 1 in the Marta Kostyuk vs Sloane Stephens professional tennis match in the 2026 US Open Women Singles Round Of 64, then the market resolves to Yes.

timeline

opened · Aug 31, 2026closedresolved · Sep 2, 2026

Marta Kostyuk · prices over time

−24h

now

volume · by outcomehover a column to inspect

no volume history

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