Bad Homburg Open: Ekaterina Alexandrova vs Mirra Andreeva

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Market context

The underlying real-world event is the Round of 16 tennis match between Ekaterina Alexandrova and Mirra Andreeva at the Bad Homburg Open, scheduled to commence at 11:00 am on Centre Court today. While the prediction market currently implies a 100% probability that Alexandrova will advance, this starkly diverges from the broader sportsbook consensus, where Mirra Andreeva is the clear favourite with odds of 1.35 against Alexandrova’s 3.18[1]. Analysts at Tennis Tonic and Probahis explicitly predict Andreeva to win in two sets, noting her superior form on grass despite Alexandrova’s natural grass profile[1][2]. This 100% implied probability represents a significant anomaly, suggesting either a mispricing in the prediction market or a misunderstanding of the contract’s resolution rules regarding match completion.

Historically, similar 100% implied probabilities in prediction markets for tennis matches have resolved to fair prices when matches were cancelled or delayed beyond the settlement window, as seen in Kalshi’s rules for unplayed events[4]. Comparable cases from the 2026 WTA Bad Homburg tournament show that Alexandrova has previously defeated Andreeva in a Round of 16 match, winning 6-3, 6-4, which may explain the bullish sentiment despite current odds favouring Andreeva[6]. However, traders must watch for immediate announcements regarding player injuries or withdrawals, as Andreeva is currently listed with no injury concerns while Alexandrova’s recent three-set victory against Ann Li could indicate fatigue[2][9]. The settlement window ending on 1 July 2026 means any delay beyond seven days without a winner will resolve the market to a 50-50 split, a critical dependency for risk assessment[4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Bad Homburg Open: Ekaterina Alexandrova vs Mirra Andreeva 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

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?

On Best Prediction Markets, 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.

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 does it cost to trade on Best Prediction Markets?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Best Prediction Markets 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.