Cincinnati Open: Thiago Agustin Tirante vs Arthur Fils

Platform comparison

Market context

Thiago Agustín Tirante’s quarter-final against Arthur Fils sits inside the Cincinnati Open’s hard-court main draw, with the match listed for 21 August and quarter-finals spread across 20–21 August before the event runs through 23 August[6][11][14]. The crowd-implied 25% on Tirante leaves Fils as the clear favourite, which is consistent with pre-match pricing that has generally put Fils around the 75–80% range and Tirante near 20–25%[1][5][15].

For a programme or trading bot, the key read is that this is a first meeting, so there is no head-to-head history to anchor live adjustments[2][3][9]. In that situation, models tend to weight ranking, surface record and recent hard-court form more heavily than matchup lore; the market’s current level is already close to the published pre-match projection, so any edge is more likely to come from execution risk than from a basic misprice[1][12][15].

The main catalysts are scheduling and availability. Cincinnati’s quarter-finals are slated for Friday 21 August, with start times subject to court order and prior matches on the same stadium court, so a delay or late court change can move settlement risk even if the market remains open[7][11][14]. If either player withdraws, the match is postponed beyond the seven-day window, or it is abandoned before completion under the market rules, the outcome can revert to the tie handling described in the contract rather than a normal winner-determined settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Cincinnati Open: Thiago Agustin Tirante vs Arthur Fils 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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.