Newport: Mananchaya Sawangkaew vs Mary Stoiana

Platform comparison

Market context

The market tracks the WTA Challenger quarterfinal at Newport’s Hall of Fame Open, where Mananchaya Sawangkaew faces Mary Stoiana on grass. The match is scheduled for 11:00 AM ET on 10 July 2026, with the market resolving to the player who advances. A 90% implied probability for Sawangkaew suggests the crowd views her as the clear favourite on this surface, despite Stoiana’s recent second-round win over Iryna Shymanovich[6].

Grass-court tournaments historically show high variance in early rounds, yet top-100 players with prior grass experience often dominate lower-ranked opponents. In comparable WTA 125K events on grass, favourites with a winning H2H record or superior serve speed have advanced at rates exceeding 85%, aligning with the current 90% pricing[1][10]. Sawangkaew’s prior encounters and surface adaptation appear to be the key drivers behind the tight odds.

Traders should monitor pre-match warm-up reports and any late schedule changes, as Newport’s outdoor courts are weather-dependent. A delay beyond seven days or cancellation would trigger a 50-50 resolution, so real-time updates from the tournament’s official feed or live-score platforms are critical for conditional order execution[1][3]. The match’s status as a quarterfinal also means player fatigue from earlier rounds may influence performance, a factor programmatically weighted in copy-trading bots.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.