Halle Open: Daniel Altmaier vs Daniil Medvedev

Platform comparison

Active sub-markets

Market context

Daniil Medvedev’s quarter-final against Daniel Altmaier in Halle has been priced by the crowd at 47% on the Polymarket-style YES side, which sits well below the 83% projected-winner figure shown on Tennis.com for Medvedev and suggests the market is still leaving room for uncertainty around grass-court variance and match-day execution.[1] The historical read is also tilted towards Medvedev: ATP reporting on their 2025 Halle meeting says he beat Altmaier 6-3, 6-3, and TennisTemple notes the ranking gap has widened, with Medvedev up to world No 7 while Altmaier has slipped to No 81.[7][2] That kind of profile usually supports a favourite priced in the low-to-mid 80s in decimal terms on exchange-style books, whereas a prediction market quote near 47% implies a narrower edge once cancellation and settlement rules are folded in.[1][7]

The immediate catalysts are more operational than analytical: whether the quarter-final starts on schedule, whether there are any court-order or weather delays, and whether either player is managing a fitness issue after earlier rounds. Sofascore lists the match start for 19 June 2026 at 12:40 UTC in Halle, while ATP video coverage shows Altmaier advancing through the draw and Medvedev already having handled him cleanly in the previous year’s event.[3][10][7] For platform comparison, Polymarket and Kalshi quote directly in implied probability, while Betfair and Smarkets typically show decimal odds that must be converted back to probability and then adjusted for commission; that makes the same underlying view appear slightly different after fees and spreads, especially if the match is live or the market is thin. KYC access also matters: exchange-style books can be more restricted by jurisdiction than open crypto prediction markets, so the practical price available to a trader may diverge from the headline crowd number.[1][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Halle Open: Daniel Altmaier vs Daniil Medvedev specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. 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). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Alternative is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

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.