Halle Open: Daniel Altmaier vs Daniil Medvedev

Platform comparison

Active sub-markets

Market context

Daniel Altmaier and Daniil Medvedev are due to meet in the Halle Open quarter-final, and this prediction market settles on the player who *advances* rather than on set score or total games. In practice, a **YES** share means Altmaier advances, while a **NO** share means Medvedev advances; if the match is cancelled, left unresolved beyond the market’s seven-day window, or otherwise produces no winner under the rules, the contract can end 50-50 instead.[1][2][4]

The current crowd-implied probability of 41% for YES sits below a coin flip, which lines up with the broader shape of the head-to-head and recent market signals. ATP reporting from last year said Medvedev beat Altmaier 6-3, 6-3 in Halle, and Tennis.com’s pre-match projection for this quarter-final also gives Medvedev the stronger chance, around 83%.[1][9] For a newcomer to prediction markets, that means the market is not pricing Altmaier as the favourite, but it is still allowing for upset risk, especially in a short grass-court match where a few service breaks can swing the outcome quickly.[1][4]

The main catalysts are simple: whether the match starts on time, whether the ATP schedule keeps this quarter-final intact, and whether either player withdraws or the contest is interrupted by weather or a walkover. TennisLive and SofaScore both list the match for 19 June at Halle, so any official change to the draw or order of play would matter immediately for settlement expectations.[3][4] Robinhood’s own market language also notes that if a match cannot be unconditionally settled, the exchange may fall back to a fair-market valuation rather than a normal winner-takes-all result.[2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Prediction Market UK 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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.

What does it cost to trade on Prediction Market UK?

Zero. Prediction Market UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.