National Bank Open: Daniel Merida Aguilar vs Learner Tien

Platform comparison

Market context

Polymarket has this match priced at **3% YES** for Daniel Merida Aguilar, which leaves Learner Tien as the heavy on-chain favourite in a USDC-denominated contract on Polygon. In practical terms, that means the market is assigning only a small chance that Merida Aguilar is the player who advances before the settlement window closes on 18 August 2026.

That discount is consistent with the wider tennis pricing. Bookmakers had Tien around the low-1.5 to low-1.7 range and Merida Aguilar around 2.5 to 2.8, while Tennis Tonic and Tennis.com both pointed to Tien as the projected winner. String Tension’s Elo model also leaned strongly towards Tien, giving him roughly three-quarters win probability on hard courts, which fits a market where Merida Aguilar is being treated as a live but clear underdog rather than a coin-flip opponent.

For traders, the key catalysts are simple: confirm the match is actually played, watch for any change to the scheduled start time, and follow whether the result is completed inside the seven-day dispute window that governs this contract’s fallback to 50-50 if no winner is determined. Because the market resolves only on advancement, not performance quality, late withdrawals, retirements before completion, or a full cancellation matter more than pre-match narrative. Live court updates and draw status are the decisive inputs, with the main question being whether Tien’s pre-match edge holds or Merida Aguilar turns the match into a longer, more uncertain state before settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Scam?, which mirrors the Polymarket order book directly.

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.

UK Frequently Asked Questions

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

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.