Pronóstico: National Bank Open: Fabian Marozsan vs Matteo Arnaldi

Platform comparison

Market context

Polymarket is pricing this contract at **56% yes** on the Fabian Marozsan side, which means the market is slightly leaning towards Marozsan advancing but still leaves a meaningful chance on Matteo Arnaldi. Because settlement is on-chain in **USDC** via **Polygon** conditional tokens, the key trading question is not the abstract rivalry but whether the match is actually completed in the format the market needs for a clean winner; if it is not played, or is delayed beyond seven days without a result, the contract settles at 50-50.

The historical read is straightforward: Arnaldi has the edge in the head-to-head, having beaten Marozsan in all recorded meetings, including a straight-sets win in Geneva in May 2025 and an earlier San Marino result, both on slower surfaces than Toronto’s hard courts[3][5][7]. That matters because direct match-up history often anchors short-term pricing when the sample is small; here, the current 56% line sits against a 0-2 recent head-to-head for Marozsan, so the market is not fully following the past scoreline and may be discounting surface, current form, or draw context[2][4][10].

The main catalysts are simple: official scheduling, any walkover or retirement news, and whether either player’s broader National Bank Open path changes before the stated settlement window closes. With ATP events, late court changes and injury withdrawals can matter more than pre-match numbers, because the market only resolves once one player actually advances; if the fixture is postponed, rescheduled within seven days, or abandoned after starting, the payout mechanics can shift away from a standard winner-takes-all outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: National Bank Open: Fabian Marozsan vs Matteo Arnaldi 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

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.

Do I need to KYC for this market?

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