US Open, Qualification ATP: Raul Brancaccio vs Thiago Seyboth Wild

Platform comparison

Market context

Raul Brancaccio and Thiago Seyboth Wild were listed for the US Open men’s qualifying draw on hard courts in New York, with the match scheduled for 24 August 2026 and both players separated by only a modest ranking gap, Seyboth Wild at about ATP 202 and Brancaccio around ATP 232.[1][2][4] That makes the market’s 0% YES price on Brancaccio look far below the kind of split often seen on pre-match books for an evenly matched qualifier, where a player priced around 1.87 in decimal terms would typically imply something close to a coin flip before margin.[12][14]

The main read-through is that this is a scheduling-and-completion market as much as a tennis market. The official US Open qualifying window runs from 24 to 27 August, and the market settles to 50-50 if the match is not played or no winner is determined by 7 September, so traders need to watch for postponement, walkover, retirement, or a draw change rather than only the on-court result.[4][8] Kalshi was showing Thiago Seyboth Wild at 63% and Brancaccio at 37% for the same pairing, which highlights how platform framing diverges: prediction markets show raw probability, while exchange-style books such as Betfair or Smarkets usually express the same view in decimal odds and then layer on commission, with access depending on local KYC and jurisdiction.[9][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares US Open, Qualification ATP: Raul Brancaccio vs Thiago Seyboth Wild specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, 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). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.