Roland Garros WTA: Victoria Mboko vs Katerina Siniakova

Platform comparison

Active sub-markets

Market context

Victoria Mboko faces Katerina Siniakova in the first round of Roland Garros women's singles on 28 May 2026. The 100% implied probability reflects the market's assessment that this match will proceed as scheduled and produce a decisive winner. With the settlement window closing on 4 June, traders are pricing in a straightforward completion within the tournament's standard timeframe, leaving minimal room for cancellation, postponement beyond seven days, or an incomplete result.

Siniakova enters as the more established player on clay, having reached the Roland Garros quarter-finals in 2019 and maintained a consistent presence in WTA rankings across multiple seasons. Mboko, by contrast, remains a developing prospect whose clay-court pedigree is less established. Historical precedent suggests that when ranking disparity is pronounced at Roland Garros, the higher-ranked player advances in approximately 70–75% of opening-round matchups, though upsets do occur. The market's extreme confidence may underestimate Mboko's potential, particularly if recent form or surface-specific preparation has shifted the competitive balance.

Traders should monitor the official Roland Garros draw confirmation and any weather alerts for late May in Paris, as rain could trigger rescheduling. Injury announcements in the 48 hours before the match would be the primary catalyst for market movement. Court assignments and scheduling changes, typically finalised three to five days before play, may also influence confidence in the match proceeding on the stated date. No significant recent news has emerged to challenge the baseline expectation of a completed match.

Methodology

We track Roland Garros WTA: Victoria Mboko vs Katerina Siniakova on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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'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.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Prediction Today 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.