National Bank Open: Jaume Munar vs Alexander Blockx

Platform comparison

Market context

Jaume Munar and Alexander Blockx were scheduled to meet in the second round at the National Bank Open in Montréal, with the match listed for Court 9 and multiple market pages showing a close pre-match call. The crowd-implied probability of 50% matches the knife-edge pricing in the wider market: Flashscore showed Blockx as a slight bookmaker favourite at around 1.62 versus 2.30 for Munar, while TennisTemple’s prediction feed was exactly split 50/50. [2][1]

That makes this contract more useful as a read on late information than on broad season-long form. Analyst-style previews lean a little towards Blockx, with several model-based or tipster pages landing in the 60-61% range for the Belgian, while others remain closer to even money, so the market consensus is mildly Blockx-leaning rather than decisive. That is consistent with a matchup where the favourite is not overwhelming and short-format ATP tennis can swing sharply on serve and a few return games. [7][9][5]

The main catalysts are straightforward: whether the match actually starts on schedule, whether the tournament keeps it on the planned court and slot, and whether either player withdraws or receives a walkover before completion. Tennis.com still listed the fixture as a live round-two match, which matters because this contract settles on the winner only if a result is recorded; if the match is not played, is tied, or is delayed beyond seven days without a winner, it resolves to 50-50. [11][1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Jaume Munar vs Alexander Blockx 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.

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.