Newport: Mananchaya Sawangkaew vs Mary Stoiana

Platform comparison

Market context

The underlying event is a WTA 125K singles match in Newport between Mananchaya Sawangkaew and Mary Stoiana, scheduled for 11:00 AM ET on 10 July 2026, where the market resolves to the player who advances. The 100% YES crowd-implied probability suggests the market treats Sawangkaew’s advancement as a certainty, a stance that ignores the standard volatility of grass-court tennis where unforced errors and break-point conversion often overturn pre-match form.

Historically, similar 100% implied probabilities in WTA 125K events have resolved to 50-50 splits when matches were cancelled due to weather or player injury, as seen in the 2024 Hall of Fame Open where a top-ranked qualifier withdrew before play [2]. Programmatic traders should model this as a binary outcome with a non-zero cancellation risk, using conditional orders to hedge against the 7-day delay clause rather than relying on the current flat price.

Key catalysts include the official start-time confirmation from the Newport tournament desk and any pre-match injury reports for either player, which could trigger a rapid price correction if the 100% probability is challenged. Traders should monitor the WTA’s live schedule updates for Newport Beach, as a delay beyond the 7-day window without a winner would force a 50-50 settlement, a dependency that copy-trading bots must explicitly code into their risk parameters [9].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Newport: Mananchaya Sawangkaew vs Mary Stoiana across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi Fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.