US Open, Qualification ATP: Coleman Wong vs Elmer Moeller

Platform comparison

Market context

Coleman Wong and Elmer Moeller met in the first round of US Open qualifying on 24 August, a men’s singles match on the hard courts in New York. Wong entered as the higher seed and higher-ranked player, with the draw listing him around world No. 93–94 and Moeller around No. 170–172, so the market’s 100% yes price reflects a pre-play bias towards the seeded side rather than a completed result.[1][2][4]

For historical framing, qualifying markets like this are often driven by draw position, ranking spread and whether the match has already started, because those are the variables that most affect a programmatic settlement check. In this case, the live scoreboard showed the match underway on 24 August, which matters more than the headline probability: once play begins, the main risk shifts from outright winner selection to interruption, retirement, walkover handling and whether an official winner is recorded before the September settlement cutoff.[3][10][15]

The practical catalysts are administrative rather than narrative: official order of play updates, live scoring status, and any tournament rescheduling caused by weather or backlog. US Open qualifying runs from 24–27 August, with men’s singles qualifying scheduled across those days, so a trader automating conditional orders would key off whether the match is completed, suspended, or carried over rather than on broader event timing alone.[5][9][12][13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Kalshi Fees. 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.

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 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.