National Bank Open: Janice Tjen vs Liudmila Samsonova

Platform comparison

Market context

Janice Tjen’s meeting with Liudmila Samsonova is scheduled for the National Bank Open in Toronto, and the 0% YES price looks like a market that is effectively treating Samsonova as the only live side unless the match is never completed. Their only completed head-to-head was in Abu Dhabi in February 2026, when Samsonova won 6-2, 6-2 on hard court, a result that has set the baseline for how the pairing is being priced[1][7]. Current match pages also place Samsonova higher in the rankings and make her the projected winner, with Tennis.com showing Samsonova at WTA 22 against Tjen at WTA 40 and giving Samsonova a 62% win projection[2][4].

For traders, the main catalyst is simply whether the draw and start time hold, because a played match gives Tjen an immediate route to value only if there is a reversal from the earlier hard-court result[4][7]. The most relevant live signal is pre-match and in-play movement rather than broader tour form: Samsonova’s earlier straight-sets win featured stronger first-serve and return numbers, while Tjen’s path to an upset would likely depend on improving serve efficiency and avoiding the same break-point pressure[5][6]. If the fixture is delayed, shortened, or not completed within the settlement window, the market can still revert to 50-50 under the rules, so schedule risk matters alongside the on-court matchup.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks National Bank Open: Janice Tjen vs Liudmila Samsonova across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Trump Prediction provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.