Mubadala Citi DC Open: Alejandro Tabilo vs Ben Shelton

Platform comparison

Market context

Ben Shelton’s quarter-final against Alejandro Tabilo is the live event driving this market, and the latest reporting still has Shelton as the clear favourite after both men advanced on 31 July. Reuters noted Shelton came through a three-set test against Ugo Humbert, while Tabilo beat Terence Atmane in straight sets, so the current 25% crowd-implied probability is tracking an underdog view rather than a coin flip[16]. The match was listed for the Washington hard courts at 8:00 PM ET, with live listings still showing it on the schedule rather than as a completed result[4][2].

The historical frame is limited because this is their first ATP meeting, so there is no head-to-head record to lean on[3]. That leaves market readers mostly pricing in surface and style: Shelton has the higher ranking and stronger outright market support, while Tabilo has already shown he can absorb a longer match in Washington after a three-set opener[1][16]. Comparable previews from the week consistently treated Shelton as the stronger hard-court player, especially in the quicker conditions in Washington[5][13].

The main catalysts now are straightforward: whether the quarter-final starts on schedule, whether any change to the order of play pushes it back, and whether either player carries over fatigue or treatment issues from the previous round. Tournament schedule pages and live match listings are the clearest indicators to watch because the market resolves to 50-50 if the match is not played, tied, or delayed beyond seven days without a winner[15][4][2]. Reuters’ same-day roundup is the most reliable recent news source here, and it confirms the matchup was set after both players won on Thursday night[16].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Mubadala Citi DC Open: Alejandro Tabilo vs Ben Shelton 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

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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.

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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.