Newport: Reese Brantmeier vs Elizabeth Mandlik

Platform comparison

Market context

The underlying event is the WTA 125K singles match between Reese Brantmeier and Elizabeth Mandlik at the International Tennis Hall of Fame in Newport, scheduled for 11:00 AM ET on 9 July 2026 on grass courts. The market currently implies a 0% probability that Brantmeier will advance, suggesting the consensus heavily favours Mandlik, likely due to her superior grass-court pedigree and recent form. Historical precedents, such as Mandlik’s 2022 Evansville hard-court victory over Brantmeier and their contrasting doubles performances in Newport where Mandlik’s team was projected a 54% winner, frame this probability as a reflection of Mandlik’s consistent edge rather than an anomaly. Traders should watch for real-time weather updates, as Newport’s 20°C conditions with 80% humidity and 14 km/h winds could influence serve effectiveness, and monitor any late injury announcements from Mandlik’s recent schedule, given her tight turnaround between doubles and singles. Recent coverage from TennisTemple confirms the match is set for Center Court 2, but no official delay notices have been issued, meaning the 0% implied probability remains contingent on Mandlik’s full fitness and Brantmeier’s inability to adapt to grass. Value may sit contrarianly on Brantmeier if the market overreacts to Mandlik’s reputation without accounting for Brantmeier’s recent second-serve reliability (67% points won) in their latest encounter, though the consensus remains firmly on Mandlik.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Newport: Reese Brantmeier vs Elizabeth Mandlik across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 Who Will Win. 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.

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.

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.