Roland Garros ATP: Quentin Halys vs Mattia Bellucci

Platform comparison

Active sub-markets

Market context

Quentin Halys and Mattia Bellucci are scheduled to meet in the opening rounds of Roland Garros in May 2026, with the match originally set for 5:00 AM ET on 24 May. The 74% implied probability favouring Halys reflects his established ranking advantage and clay-court experience relative to Bellucci, though both players operate in the lower-ranked professional tiers where form variance and surface adaptation create genuine uncertainty. The settlement window extends to 31 May, allowing a seven-day buffer for rescheduling or completion of delayed matches.

Halys, a French player with prior ATP experience and clay credentials, typically commands odds favour in home-soil tournaments, yet Bellucci's recent trajectory and match fitness remain relevant variables. Comparable early-round upsets at Roland Garros occur at measurable frequency—approximately 15–20% of seeded-versus-unseeded matchups produce surprises—suggesting the current probability may slightly underweight Bellucci's chances. Recent ATP Challenger results and qualifying performance through May will clarify both players' form entering the tournament.

Traders comparing platforms should note that Polymarket's decimal odds conversion (approximately 1.35 for the 74% probability) differs from Kalshi's implied-probability display format, whilst Betfair and Smarkets show lay-back spreads that typically widen on lower-liquidity clay-court matches. KYC requirements vary significantly: Polymarket operates with lighter verification for some jurisdictions, Kalshi enforces stricter US-resident protocols, and Smarkets accepts broader European participation. Match cancellation or suspension beyond seven days triggers a 50-50 resolution across all platforms, a material risk given French weather patterns in late May.

Methodology

This page compares Roland Garros ATP: Quentin Halys vs Mattia Bellucci 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 PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). PolyGram routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, 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.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 PolyGram?

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

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.