Halle Open: Daniel Altmaier vs Daniil Medvedev

Platform comparison

Active sub-markets

Market context

Daniel Altmaier is scheduled to meet Daniil Medvedev at Halle, with live listings putting the match on 19 June and one preview calling it a Friday quarter-final on the grass courts at the Heristo Arena.[1][3] The market’s 59% YES price points to Altmaier advancing as the underdog, but the historical baseline leans the other way: Medvedev leads their head-to-head 2-0, and ATP records show he has won both prior meetings.[1][8] In comparable meetings, that sort of head-to-head edge has usually kept Medvedev the shorter side in match pricing, even on grass, where serve-plus-return dynamics can compress gaps between players.

For traders, the key watchpoints are the final order of play, any late rescheduling, and whether the match starts within the settlement window, because a cancellation, no-play scenario, or delay beyond seven days would push the contract to 50-50 under the market rules. Live event pages already show the fixture as active on 19 June, which reduces schedule uncertainty but does not eliminate it if earlier rounds overrun or weather disrupts the day’s programme.[2][3][6][10] From a comparison angle, the crowd-implied 59% looks more optimistic on Altmaier than a simple H2H read would suggest, so any sportsbook holdout on Medvedev may be narrower than the prediction market implies rather than fully aligned with it.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Halle Open: Daniel Altmaier vs Daniil Medvedev on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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.

FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets UK, 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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Best Prediction Markets UK triggers a quick verification flow that finishes in 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.