US Open, Qualification ATP: Toby Samuel vs Francesco Maestrelli

Platform comparison

Market context

Toby Samuel’s US Open qualifying meeting with Francesco Maestrelli was set for Court 7 on 24 August, and the draw listed Samuel as the seventh seed against an unseeded Maestrelli. The match was completed on the day, with Samuel losing in a three-set contest; that makes any live 100% price on Samuel hard to square with the actual result and with the fact that settlement in these markets can still fall back to 50-50 only if no winner is determined by 7 September.

For context, qualifying draws at the US Open are best read as short-format, high-variance events: seeded players are favoured, but first-round outcomes can turn quickly on serve quality, tiebreaks and the surface, which is outdoor hard court. On comparable exchanges, the same event is usually expressed differently: Polymarket shows an implied probability, while Betfair and Smarkets quote decimal odds that move around the same underlying chance but are easier to compare after fees.

The key catalysts were the official draw, the published day-one qualifying schedule and whether the match started and finished on the planned Tuesday slot, because postponement or suspension can shift settlement risk even when the player edges look clear. Market access also differs by venue: Polymarket and Kalshi depend on eligibility and KYC checks, while Betfair and Smarkets coverage can be broader but still limited by jurisdiction and account verification.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read US Open, Qualification ATP: Toby Samuel vs Francesco Maestrelli from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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.

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.