San Marino: Vilius Gaubas vs Thiago Monteiro

Platform comparison

Market context

Vilius Gaubas against Thiago Monteiro is a clay-court quarter-final in San Marino, and the market is pricing a Gaubas advance at 100% YES, which is far more decisive than the historical evidence would justify on its own. The pair have already met twice on clay, and Monteiro has won both matches, including a straight-sets win at Bad Waltersdorf in 2024 and a three-set win at Bastad in 2025.[7][8][15] Those results make the contract look less like a coin-flip than the current crowd signal suggests, especially because Monteiro has repeatedly handled the matchup with stronger serve return numbers and a better conversion rate on key points.[2][7]

Comparable models and head-to-head datasets also tilt towards Monteiro, though not overwhelmingly. ATP head-to-head records and third-party match databases show Monteiro leading the rivalry, while independent prediction sites have offered more moderate pricing, with one recent model giving Gaubas roughly a 58% win chance rather than anything close to certainty.[8][15][17] That means the main divergence here is between the prediction market’s 100% YES and the broader analytical consensus, which still treats Monteiro as the more proven clay-court performer in this pairing.[2][8][17]

For traders, the key catalysts are whether the ATP San Marino draw and court schedule hold, and whether the match actually starts and reaches a completed winner before the settlement window closes on 7 August. The market only needs the result to be determined; if the match is postponed beyond seven days, cancelled, or left unresolved after being started, it settles 50-50 by contract terms. Live scoreboards already list the fixture, but the practical risk is administrative rather than performance-related: withdrawal, walkover, weather delay, or a reschedule can all matter more here than late line movement.[1][5][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK 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.