PGA Tour: 3M Open Top 20

Platform comparison

Market context

The 3M Open at TPC Twin Cities is a 72-hole PGA Tour stroke-play event running from 23 to 26 July 2026, with the official PGA Tour site listing an $8.8 million purse and 500 FedExCup points. The market resolves on whether the named player finishes inside the top 20, ties included, so a 91% crowd-implied “Yes” is pricing a result that is much more common than a true top-10 sweat but still exposed to one poor round or a congested mid-pack leaderboard on Sunday.[2][3][4]

Historically, this is the kind of market where platform formatting matters more than it first appears. Polymarket typically shows a direct implied probability, while Betfair and Smarkets quote decimal prices that embed a commission layer, so the same 91% on Polymarket may look slightly shorter once exchange fees are applied. Kalshi also presents contract prices rather than pure odds, and access can depend on KYC and regional availability, which affects who can cheaply arb the market; for a top-20 golf finish, the practical question is not just the headline price but whether the venue you use charges a spread or fee that eats a small edge.

The main catalyst is the tournament itself: the field was set after the entry deadline, and the event is being played in its intended slot as one of the final regular-season stops before the FedExCup Playoffs.[5][6][8] Traders should watch the official PGA Tour leaderboard for withdrawals, injuries, weather and tee-time shifts, because any pre-round scratch changes the set of finish outcomes immediately, while the August 1 fallback deadline means unresolved results default to “No” if the Tour has not posted final standings in time.[1][2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read PGA Tour: 3M Open Top 20 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 mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.