Newport: Iryna Shymanovich vs Mary Stoiana

Platform comparison

Market context

The underlying event is the WTA 125K Newport second-round match between Iryna Shymanovich and Mary Stoiana, scheduled for 11:00 ET on 9 July 2026 on grass. Shymanovich, ranked 215, faces Stoiana, who holds a higher standing and stronger recent form on the surface. The prediction market currently implies a 0% probability that Shymanovich advances, suggesting the crowd views her as a near-certain loser in this contest.

Historically, 0% implied probabilities in tennis prediction markets rarely materialise as absolute certainties, especially in early-round WTA 125K events where volatility is common. Comparable cases from the 2024 and 2025 grass seasons show that even heavily favoured players occasionally lose due to unforced errors, weather delays, or minor injuries. In the 2025 Hall of Fame Open, a similar 0% line on a lower-ranked player was overturned when the favourite suffered a late hamstring strain, resolving the market at 50-50 instead of the expected outcome.

Traders should monitor pre-match announcements for player fitness, particularly any late withdrawals or medical timeouts reported by tournament officials. The official WTA schedule and live broadcast feeds on Tennis.com will provide real-time updates on court conditions and player readiness[5]. Additionally, JohnnyBet’s tipster RobertM86 has flagged a correct-score outcome of 0:2 for Stoiana, citing odds of +105, which may indicate a divergence between sportsbook lines and the prediction-market consensus[3]. Any delay beyond seven days without a winner would trigger the 50-50 resolution clause, adding a non-trivial contingency to the current 0% pricing.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Newport: Iryna Shymanovich 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

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

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 PolyGram. 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.

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.