Cincinnati Open: Stefanos Tsitsipas vs Felix Auger-Aliassime

Platform comparison

Market context

The Cincinnati Open match between Stefanos Tsitsipas and Felix Auger-Aliassime, scheduled for 16 August 2026, currently trades at 0% implied probability for a Tsitsipas victory on Polymarket, suggesting the market has already priced in either a withdrawal, cancellation, or overwhelming confidence in Auger-Aliassime's advancement. With the settlement window closing on 23 August at 14:00 UTC, traders have a seven-day buffer beyond the original match date before the contract resolves to 50-50 conditional tokens if no result materialises. The USDC-denominated contract on Polygon reflects extreme pricing that warrants scrutiny, particularly given the conditional token mechanics mean any unplayed match defaults to equal split across both outcomes.

Historically, Tsitsipas holds a 4–3 head-to-head record against Auger-Aliassime, though their most recent encounters favour the Canadian, who defeated him at the 2024 Canadian Open. Auger-Aliassime's trajectory on hard courts has improved markedly, whilst Tsitsipas has struggled with consistency on faster surfaces. The 0% probability likely reflects either confirmed withdrawal information or market dysfunction rather than genuine predictive consensus, as even heavily favoured players rarely trade at absolute extremes in tennis markets.

Traders should monitor official ATP communications regarding player fitness and draw confirmations through mid-August. Any announcement of injury, illness, or withdrawal would trigger immediate settlement mechanics. The scheduling dependency—whether both players progress through earlier rounds without disruption—remains the primary catalyst, alongside any weather delays that could push the match beyond the seven-day grace period and force the 50-50 resolution.

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

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 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.