What is the current probability for "US Open, Qualification ATP: Stefano Napolitano vs Mackenzie McDonald"?

The contested Polymarket outcomes for "US Open, Qualification ATP: Stefano Napolitano vs Mackenzie McDonald" are US Open, Qualification ATP: Stefano Napolitano vs Mackenzie McDonald Match O/U 21.5 59%, US Open, Qualification ATP: Stefano Napolitano vs Mackenzie McDonald Match O/U 22.5 51%, US Open, Qualification ATP: Stefano Napolitano vs Mackenzie McDonald Game Spread +/-4.5 50% — 2 of 16 outcomes are already 95%+. Refreshed continuously.

When does this market resolve?

This event resolves on 8/31/2026.

How is the probability calculated?

pdata reads the latest market prices directly from polymarket'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/polymarket/898567. An MCP server with 9 tools is available at https://api.pdata.world/mcp. Full agent guide: https://pdata.world/agents.md.

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event16 outcomes

US Open, Qualification ATP: Stefano Napolitano vs Mackenzie McDonald

·Sports·ends Aug 31, 2026

vol cum

$24.7k

vol 24h

$26.8k

outcomes

ends

Aug 31, 2026

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TennisSportsGames

marketselected outcome

US Open, Qualification ATP: Stefano Napolitano vs Mackenzie McDonald Set 1 O/U 8.5

rank #1

100¢

▲ 50.5pp

24h change

vol cum

vol 24h

spread

0.00

ends

Aug 31, 2026

This market refers to the tennis match between Stefano Napolitano and Mackenzie McDonald in the US Open, Qualification ATP, originally scheduled for August 24, 2026 at 3:30PM ET. This market will resolve to "Over" if the total number of games completed in the first set equals or exceeds 9. Otherwise, it will resolve to "Under." Any first-set tiebreak counts as one (1) game toward the total. If the first set is not completed for any reason, this market will resolve 50-50. If the match is canceled before play begins, or play has not begun by September 7, 2026, 11:59 PM ET (14 days after the scheduled start), this market will also resolve 50-50. Resolution will be based on official Grand Slam results.

timeline

opened · Aug 23, 2026opencloses · Aug 31, 2026

US Open, Qualification ATP: Stefano Napolitano vs Mackenzie McDonald Set 1 O/U 8.5 · prices over time

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