National Bank Open: Ann Li vs Elena Rybakina

Platform comparison

Market context

Polymarket is pricing this contract at **0% YES**, which means traders are currently assigning essentially no chance that Ann Li advances over Elena Rybakina in this National Bank Open match. On Polymarket, the position settles through conditional tokens on Polygon and is funded in USDC, so the market is a direct read on the crowd’s expectation of the match outcome rather than a bookmaker-style outright price.[4]

The wider betting market points the same way. Rybakina is a heavy favourite across listed prices, with multiple books showing her around 1.14-1.16 and Li around 5.0-5.7, while preview services are also picking Rybakina in straight sets.[1][2][3][7][10][15] That makes the 0% Polymarket print easier to read as a near-unanimous lean towards the higher-ranked player, rather than a signal that the match is untradeable.

For traders, the main catalysts are basic but important: the official start time, any last-minute withdrawal or walkover, and whether the match is completed normally. Polymarket’s rules are outcome-specific: a walkover, cancellation, tie, or a delay beyond seven days without a winner can trigger a 50-50 style resolution rather than a normal winner settlement.[4] Tennis schedule slips are common enough that the key watch items are the tournament order of play and any late injury news around either player, especially as this is a third-round match with one player far stronger on paper.[2][5][11]

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

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 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram 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.