Roland Garros ATP: James Duckworth vs Rafael Jodar

Platform comparison

Active sub-markets

Market context

James Duckworth, the Australian left-hander ranked outside the top 100, faces Rafael Jodar of Spain in the opening round of Roland Garros in late May 2026. The match carries minimal historical precedent between the two players, with Jodar operating at a significantly lower ranking tier than Duckworth. The 0% implied probability across prediction platforms reflects Duckworth's substantial seeding advantage and recent form relative to his opponent, though such extreme readings are uncommon on major tennis matchups and warrant scrutiny against comparable first-round encounters at Grand Slams.

Platform divergence emerges in how different books price this mismatch. Polymarket's binary YES/NO structure renders the 0% reading as a technical floor rather than a genuine market assessment, whereas Kalshi and Betfair express equivalent conviction through decimal odds (often 1.01–1.02 range), making the marginal probability shift more visible to traders. Smarkets' commission structure on heavily skewed markets can inflate effective odds beyond stated decimals, creating arbitrage opportunities for those monitoring cross-platform spreads. The settlement window closing 7 June 2026 allows three days beyond the scheduled 27 May date for completion, standard for Roland Garros scheduling but relevant if rain or injury complications emerge.

Traders should monitor official Roland Garros draw confirmations and any late injury withdrawals from either player in the weeks preceding the tournament. Duckworth's recent ATP Challenger results and Jodar's qualifying performance will clarify whether the 0% reading reflects genuine form divergence or market inefficiency. Surface preference data—Duckworth's clay-court record versus Jodar's—provides concrete adjustment points if either player's pre-tournament preparation shifts materially.

Methodology

This page compares Roland Garros ATP: James Duckworth vs Rafael Jodar specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 it cost to trade on Polymarket Alternative UK?

Zero. Polymarket Alternative UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative UK triggers a quick verification flow that finishes in minutes.

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.