National Bank Open: Janice Tjen vs Liudmila Samsonova

Platform comparison

Market context

The immediate market read is that Liudmila Samsonova entered this pairing with the stronger established track record against Janice Tjen, which helps explain why the crowd-implied price is pinned near zero for Tjen. Samsonova beat Tjen 2-0 in their only previous meeting in Abu Dhabi in February 2026, and match pages list Samsonova ahead in the head-to-head as well as higher in the WTA singles rankings at the time of this Toronto meeting.[1][2][4][6]

That history matters because it is one of the few direct comparables available, and the sample leans cleanly one way: Samsonova won in straight sets and controlled the key service-return metrics in that earlier match.[6][8] By comparison, Tjen’s route into a live upset case depends on whether this latest hard-court matchup behaves differently from the February meeting, rather than on any prior head-to-head evidence pointing her way.[1][5][16]

For traders, the main catalysts are procedural rather than narrative: whether the scheduled National Bank Open start is confirmed, whether the match is delayed, and whether either player advances without completing the fixture, because the market rules force a 50-50 settlement if the match is not played or is left unresolved beyond the window. Live score listings already showed the pairing on the Toronto order of play, so the key near-term watch items are official tournament updates, any rescheduling, and any withdrawal or walkover notice before play begins.[4][12][15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track National Bank Open: Janice Tjen vs Liudmila Samsonova 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.