National Bank Open: Janice Tjen vs Liudmila Samsonova

Platform comparison

Market context

Polymarket’s contract is still marked at **0% YES**, which means the market is effectively pricing no meaningful chance of Janice Tjen advancing against Liudmila Samsonova via the USDC-settled, Polygon-based conditional token. For traders, that does not mean the outcome is impossible; it means the order book is currently assigning it negligible probability, so any live update to the draw, start time or official result could reprice it quickly.

The historical read-through is straightforward: Samsonova has already beaten Tjen once, 2-0 on hard court in Abu Dhabi in February 2026, and that head-to-head is the cleanest comparable case for this matchup.[1][6][8] Ranking data in the match listings also shows Samsonova as the more established player, though Tjen has been listed with the higher current singles ranking in some 2026 match pages, which is a reminder that markets react to recent form as much as career reputation.[2][5] In practical terms, a 0% contract price usually reflects either a strongly favoured favourite or thin liquidity, so the on-chain price can remain pinned until a concrete catalyst arrives.

The main things to watch are the official National Bank Open schedule, whether the match starts on time, and any late withdrawal or walkover news from tournament organisers or live score providers.[5][11][15] If the match is delayed beyond the market’s seven-day window without a winner, or is not played at all, the contract resolves to 50-50 rather than a side, which matters more here than in a standard outright market. Because the settlement window runs to 2026-08-10T14:00:00Z, any ambiguity around court scheduling, injury, or a rain-affected queue can matter as much as the tennis itself.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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