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 welterweight Daniil Donchenko at UFC Fight Night 280 in Baku, with the bout scheduled for 13:00 UTC today. Donchenko, a 14-2 TUF winner, holds a clear edge in experience over Berggren’s 8-3 record, and most analysts predict a Donchenko TKO victory before the crowd-implied probability of 0% YES for Berggren solidifies.

Historically, late replacements in UFC prelims rarely overturn established favourites, especially when the opponent is a decorated TUF alum; similar cases from 2019 and 2022 show replacement fighters winning only 12% of such matchups, often via fluke finishes. Programmatic traders would model this market as a near-certain Donchenko win, using conditional orders to lock in value before the fight starts, while bots might skip Berggren entirely given the statistical disparity.

Traders should monitor official UFC weigh-in confirmations and any pre-fight injury updates, as a No Contest or technical draw would reset the market to 50-50. Recent coverage from Sherdog notes Donchenko’s return to the Octagon is his first since 2024, adding weight to his momentum narrative, while DraftKings picks align with the TKO prediction, reinforcing the 0% Berggren probability as factually grounded rather than speculative.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket Bot 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 does it cost to trade on Polymarket Bot UK?

Zero. Polymarket Bot UK 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, Polymarket Bot UK 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.