US Open, Qualification ATP: Harry Wendelken vs Stefano Travaglia

Platform comparison

Market context

Harry Wendelken and Stefano Travaglia have already been drawn against each other in US Open qualifying, with the ATP listing the match in the men’s singles qualifying draw and the LTA noting it as a first-round British tie for Wendelken against the 26th seed. That matters because a market priced at 100% YES is effectively assuming the match has been played and a winner has already been established, rather than a live unresolved fixture.

The closest comparison is the live price on the exchange-style books: Kalshi has shown Wendelken around 60% and Travaglia around 40%, expressed in cents rather than decimal odds. That is a very different framing from Betfair or Smarkets, where traders typically see decimal odds and then back out implied probability after commission; on those venues, the headline percentage will look lower once fees are included. Polymarket’s settlement rules also matter here: if the match was not completed before the deadline or was voided, the market can still settle at 50-50, which is a separate outcome from either player advancing.

For catalysts, the key items are whether the US Open qualifying result is formally recorded, whether there is any suspension or scheduling reshuffle at the USTA Billie Jean King National Tennis Centre, and whether a retirement or walkover is later classified as a completed match under the market rules. Public scoreboards showed the contest as completed, with Wendelken leading the exchange price during play and eventually being reported as the winner by multiple tennis data services. That combination usually resolves ambiguity quickly, but final settlement still depends on the official match status used by the venue and by the market’s deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares US Open, Qualification ATP: Harry Wendelken vs Stefano Travaglia 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

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.