Bad Homburg Open: Venus Williams vs Irina-Camelia Begu

Platform comparison

Active sub-markets

Market context

Venus Williams is due to face Irina-Camelia Begu in the first round of the Bad Homburg Open, and the crowd price of 39% implies Begu is the clear favourite despite a market that is still far from settled. Tennis.com’s match page shows Williams-Begu as a live Round 1 fixture and gives Williams an 83% projected winner figure, which is notably higher than the prediction-market price and suggests the venue’s pre-match model is far more bullish on Williams than the crowd is. [1]

For context, this is the sort of match where small scheduling and fitness signals can move the market sharply: WTA and tournament listings place the match on 22 June, Centre Court, with the event running from 19 to 27 June, so any late change to order of play, withdrawal, or walkover would matter more than historical head-to-head noise. The WTA player list shows Williams as a lucky loser and Begu as a wildcard, which can also affect how traders weigh baseline form and likelihood of a completed match. [5][6] On a platform like Polymarket, the quote is a direct implied probability; on Kalshi or Betfair, the same matchup would usually be shown as decimal odds that embed a payout structure, while Smarkets displays exchange-style prices that reflect available liquidity and commission. That means a 39% market on Polymarket is not mechanically the same as 2.56 in decimal odds elsewhere once fees, spread, and exchange access are included. KYC and geographical reach also differ: regulated books and exchanges generally require more formal verification and have tighter market access than crypto-native prediction markets.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Bad Homburg Open: Venus Williams vs Irina-Camelia Begu 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

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.

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 Polymarket Alternative?

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

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.