MLB: Doubles Leader

Platform comparison

Market context

The 2026 MLB regular season will determine which player accumulates the most doubles across all 162 games. Doubles represent a measurable, auditable statistic tracked consistently across all teams and venues, making this a straightforward settlement criterion. The market resolves after the regular season concludes, with tiebreakers cascading through batting average and slugging percentage if multiple players finish level on double count.

Historically, the doubles leader has ranged between 50 and 60 doubles per season in recent years. In 2024, Juan Soto led MLB with 41 doubles; in 2023, Mookie Betts topped the league with 50. The 2% probability assigned to this market reflects the difficulty of predicting which individual will lead a fragmented statistical category across 30 teams. Unlike home run leaders, doubles are less concentrated among elite power hitters and more distributed across contact-oriented players, making the outcome dependent on injury status, playing time allocation, and mid-season trades affecting roster composition.

Traders monitoring this market should track spring training performance reports and opening-day rosters, as early-season injury announcements reshape contention. Watch for trades during the July deadline that might relocate high-doubles-rate players to different ballparks with varying dimensions. Batting order placement changes and platoon decisions within organisations can materially affect plate appearances for candidates. Real-time double tallies become available through MLB's official statistics portal and third-party APIs; conditional order systems can automate position adjustments as players' cumulative totals shift throughout the season, allowing programmatic rebalancing without manual intervention.

Methodology

We track MLB: Doubles Leader across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi 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 itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.