Philadelphia: Fiona Crawley vs Julia Grabher

Platform comparison

Market context

Polymarket has this contract at 6% YES, implying traders see Fiona Crawley as a long shot against Julia Grabher in Philadelphia. On Polymarket, the position is held through USDC on Polygon and resolves via conditional tokens, so the key practical question is not the pre-match headline but whether the match is completed, abandoned, or pushed into the 14-day no-winner fallback that settles 50-50.

Grabher already came through the earlier round and the pairing sits in the Philadelphia WTA 125 draw, a hard-court event running 23-29 August, which makes the market especially sensitive to the live tournament tree rather than a standalone ranking gap. Crawley has been priced well below Grabher in third-party match models too, with pre-match projections around the mid-40s to mid-50s in Grabher’s favour, while live listings also show the contest as suspended or in progress at points, underlining how quickly prices can move when play is interrupted.

The main catalysts are simple: official order-of-play updates, whether the quarter-final or replacement slot is actually completed, and any retirement, postponement, or weather delay. The WTA event schedule shows singles action concentrated across the week and sessions remain subject to change, so traders should watch for revised court times and completion status rather than assuming the scheduled start tells the full story. If the match is not played at all, ends level, or no winner is recorded by the resolution deadline, the market flips to 50-50.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.