Roland Garros ATP: Ignacio Buse vs Andrey Rublev

Platform comparison

Active sub-markets

Market context

Ignacio Buse, the Peruvian qualifier ranked outside the top 200, faces world number six Andrey Rublev in the opening round of Roland Garros in late May 2026. The 34% implied probability on Polymarket reflects a significant underdog position for Buse, though the decimal odds representation (roughly 2.94 on Kalshi's equivalent framing) highlights how different platforms' native formats can obscure the true gap. Betfair's traditional fractional odds would display this as approximately 19/6, a format that emphasises the longer shot more starkly than percentage language does. The scheduling window—a 5:00 AM ET start on a clay court where Rublev has historically performed well—introduces logistical variables that affect both players' preparation routines, a factor often underweighted in early-round projections.

Buse's pathway to this match required qualifying victories, whereas Rublev enters as a seeded player with direct main-draw entry and substantially more recent competitive clay-court exposure. Historical precedent from lower-ranked qualifiers against top-ten seeds at Roland Garros shows roughly 8–12% conversion rates, suggesting the current 34% may incorporate some overestimation of Buse's chances. Rublev's 2025 clay-court record and recent ATP 500 performances provide concrete reference points; his fitness status and any late-tournament withdrawals from earlier events would shift the probability meaningfully.

Traders should monitor official Roland Garros draw confirmations and any injury bulletins released within 48 hours of the match. Polymarket's settlement window extends to 31 May, providing a seven-day buffer for delays or walkovers. Fee structures vary significantly—Polymarket's 2% maker/taker versus Kalshi's fixed spreads—making position sizing calculations platform-dependent even when underlying probabilities converge.

Methodology

This page compares Roland Garros ATP: Ignacio Buse vs Andrey Rublev 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.

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 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.