Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Review UK) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Trade this market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Trade this market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Trade this market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Trade this market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set 1 O/U 8.5 | 100% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set 1 Winner | 100% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set 2 O/U 8.5 | 100% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set 2 O/U 9.5 | 100% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set 2 O/U 10.5 | 100% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo | 77% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Total Sets: O/U 2.5 | 75% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Match O/U 21.5 | 75% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Match O/U 22.5 | 75% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Match O/U 23.5 | 75% |
| Completed Match | 50% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set Handicap +/-1.5 | 25% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set Handicap +/-1.5 | 25% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set 2 Winner | 0% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set 1 O/U 9.5 | 0% |
| Brownsburg: Stefan Kozlov vs Aidan Mayo Set 1 O/U 10.5 | 0% |
Market context
Stefan Kozlov faces Aidan Mayo in a Brownsburg-based tennis match originally scheduled for 11 August 2026. The 79% implied probability favours Kozlov, reflecting his established ranking and recent form relative to Mayo's profile. Settlement occurs on 18 August, providing a one-week window for match completion; cancellation, ties, or delays beyond that threshold trigger a 50-50 resolution.
Kozlov's career trajectory offers the primary historical anchor. As a former top-100 player with ATP-level experience, he typically commands favourability against lower-ranked opponents in domestic tournaments. Mayo's comparative record—whether he competes primarily on Challenger circuits or holds ITF credentials—determines whether the 79% reading represents genuine form differential or standard seeding bias. Traders automating position sizing should cross-reference both players' surfaces records; Brownsburg's court composition will materially shift expected win probabilities if either specialises in clay or hard court play.
Schedule dependencies merit programmatic monitoring. Tournament draws often shift due to withdrawals or injury announcements in the 48 hours preceding matches. Conditional order logic should flag any official postponement notices from the tournament operator, as these trigger the seven-day extension clause. Recent ATP and Challenger schedules show increasing fixture congestion in August; if either player carries injury concerns or competing commitments, news outlets covering professional tennis circuits will report changes before formal tournament updates. Tracking withdrawal patterns from comparable August events provides a baseline for assessing cancellation risk beyond the stated 79% probability.
Methodology
This page reviews Brownsburg: Stefan Kozlov vs Aidan Mayo across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Review UK, which mirrors the Polymarket order book at 0% fees.
Resolution & payout
Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.
Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.
UK Frequently Asked Questions
- Where can I trade this market with the lowest fees?
- Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- 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.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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