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

Platform comparison

Active sub-markets

Market context

Theodor Berggren faces Daniil Donchenko in a welterweight preliminary bout at UFC Fight Night: Fiziev vs. Torres in Baku on 27 June 2026. Donchenko, a former TUF winner with two straight UFC victories, enters as the clear betting favourite, while Berggren, a late replacement for Andreas Gustafsson, is the underdog.

Historical precedents for late replacements in UFC prelims show a high failure rate, often resolving in underdog losses within 1.5 rounds, mirroring Donchenko’s TKO prediction. This aligns with the current 0% crowd-implied probability for Berggren. On Polymarket, this is expressed as a decimal probability of 0.00, whereas Kalshi might frame it as a 0% implied chance with stricter KYC, and Betfair would list decimal odds of 1.01 for Donchenko, reflecting divergent fee structures and market access.

Traders should monitor official UFC fight-night announcements for any late changes to the bout status or weight class, as these can trigger a 50-50 resolution if the fight is ruled a No Contest. Recent coverage from BetMGM confirms Donchenko’s -500 odds and Berggren’s +360 underdog status, reinforcing the market’s directional bias. Watch for the settlement window closing on 28 June 2026 at 03:59:59 UTC, with resolution sourced solely from official UFC data.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read UFC Fight Night: Theodor Berggren vs. Daniil Donchenko (Welterweight, Prelims) from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, 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?

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.

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 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.