UFC Fight Night: Theodor Berggren vs. Daniil Donchenko (Welterweight, Prelims)

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Market context

Theodor Berggren steps in as a late replacement for Andreas Gustafsson to face Daniil Donchenko at UFC Fight Night in Baku on 27 June 2026. Donchenko, a colourful TUF winner, is heavily favoured by analysts and bookmakers, with Berggren’s market-implied probability of winning sitting at 0% despite his 8–3 record. This stark divergence between the zero-cent prediction market and the 19¢ Robinhood price highlights a meaningful gap in cross-platform odds, where sportsbooks assign Berggren a marginal chance while prediction markets treat him as a non-contender.

Historically, late replacements in welterweight prelims rarely overturn seasoned TUF graduates, mirroring cases where debutants faced established contenders with minimal preparation time. Donchenko’s official pick to win by TKO and the 83¢ Robinhood valuation reinforce this pattern, suggesting Berggren’s 0% probability reflects a consensus that his late entry is a decisive disadvantage. Traders should watch for any official UFC announcements regarding fight status, as delays or no-contest rulings would shift the market to a 50–50 resolution, per the contract rules.

Key catalysts include the final fight card confirmation and any medical updates from the UFC, which could alter the odds if Donchenko faces injury or if Berggren gains unexpected preparation time. As noted by The Stats Zone, Donchenko’s TKO prediction remains the dominant analyst view, underscoring the risk of betting against such a clear favourite in a prelims bout. With the settlement window ending 28 June 2026, traders must monitor real-time UFC communications to avoid mispricing the 50–50 contingency.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track UFC Fight Night: Theodor Berggren vs. Daniil Donchenko (Welterweight, Prelims) 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, 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.

Is this market available outside the US?

Best Prediction Markets 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.

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 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.

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.