Newport: Iryna Shymanovich vs Mary Stoiana

Platform comparison

Market context

The underlying event is the WTA 125K Newport singles match between Iryna Shymanovich, ranked 215, and Mary Stoiana, ranked 130, scheduled for 11:00 AM ET on 9 July 2026. With the prediction market showing a 0% implied probability for Shymanovich advancing, the odds reflect a stark divergence from sportsbook lines that still offer marginal value on the Belarusian, while analyst consensus heavily favours the American based on ranking disparity and recent form.

Historically, matches where a player ranked over 80 spots lower faces a top-150 opponent in early-round WTA 125K events rarely produce upset victories, with data from the 2024 and 2025 seasons showing fewer than 5% success rates for such underdogs in similar conditions[3][10]. This pattern frames the current 0% probability not as an anomaly but as a logical extension of established performance trends, where ranking gaps of this magnitude in Newport’s humid, slow-court environment typically result in decisive wins for the higher-ranked competitor.

Traders should monitor the official WTA match start confirmation and any weather-related delays, as Newport’s outdoor courts are susceptible to sudden rain interruptions that could postpone play beyond the seven-day settlement window[4]. Recent scheduling updates from TennisRatio confirm the match is set for the second round with no prior cancellations, but any delay beyond 11:00 AM ET could trigger a 50-50 resolution if the winner is not determined within the deadline[3]. The official WTA player page for Stoiana also notes no recent injury reports, reinforcing the expectation of a full-strength contest[2].

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

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 vs Polymarket. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.