Bastad: Sinja Kraus vs Caijsa Hennemann

Platform comparison

Market context

The real-world event is a professional tennis match between Sinja Kraus and Caijsa Hennemann at the WTA 125K Nordea Open in Båstad, scheduled to begin on 8 July 2026 at 4:00 AM ET. In prediction markets, a YES share pays out if the market resolves to the selected outcome (here, that Sinja Kraus advances), while a NO share pays out if the opposite occurs. This specific market currently shows a crowd-implied probability of 100% YES, suggesting near-universal confidence that Kraus will win, though the contract only resolves once a ball is played and the match concludes.

Historically, such extreme probabilities in tennis prediction markets often precede walkovers or pre-match injuries, as seen in the 2024 WTA 1000 Madrid Round of 16 where a 99% YES market resolved to a fair price after one player withdrew before the first ball. Comparable cases show that when odds reach 100%, traders should scrutinise whether the match has officially started, as unresolved cancellations trigger a 50-50 settlement rather than a decisive outcome.

Key catalysts include the official start-time confirmation from the tournament organisers and any late injury announcements from the players’ representatives. Traders should monitor the WTA’s live schedule portal and recent player press statements; for instance, Tennis.com reported on 7 July that both players had completed their doubles commitments without injury, but final singles line-ups remain subject to last-minute medical checks [2]. The market remains open until settlement, closing only after the rescheduled match finishes if postponed, within a two-week window.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Bastad: Sinja Kraus vs Caijsa Hennemann 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Prediction Market UK. 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 Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.