Istanbul 2: Harmony Tan vs Anastasia Gasanova

Platform comparison

Market context

Harmony Tan and Anastasia Gasanova face off in their scheduled Istanbul 2 WTA match today, with the contest set to determine who advances to the next round. The prediction market currently implies a 100% probability that Tan will win, yet Robinhood’s prediction market shows a divergent split, pricing Gasanova at 56¢ and Tan at 44¢, suggesting a near-even contest rather than a certainty [1]. This stark divergence between the 100% implied probability on one platform and the roughly 50-50 pricing on another highlights a significant cross-platform odds discrepancy that traders must scrutinise before committing capital.

Historically, such extreme probability gaps in tennis prediction markets often stem from misaligned data feeds or delayed updates regarding player availability, rather than genuine consensus on match outcome. Comparable cases in WTA events show that when one platform prices a player as a near-certain winner while another treats the match as a coin flip, the market usually corrects once live odds from major sportsbooks align with the more conservative prediction-market view. The 100% YES pricing here appears anomalous given the head-to-head stats and the competitive nature of the Istanbul 2 draw, where Gasanova has shown resilience in similar conditions [2].

Traders should monitor real-time updates on player fitness and any official WTA announcements regarding match delays or cancellations, as these are the primary catalysts that could shift the settlement from a Tan win to the 50-50 default clause. The match is scheduled for 6:00 AM ET today, and any delay beyond seven days without a winner determined will trigger the 50-50 resolution, making timing a critical dependency. With the settlement window closing in 2026, the immediate focus remains on whether the match proceeds as planned and whether the pricing divergence narrows once live action begins.

Sources: 1 · 2

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 PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.