Compares tennis and golf prices on Polymarket, Kalshi and Pinnacle. Every price is the cost, including fees, of a contract that pays $1. If backing a player to win on one venue and not to win on another costs less than $1 in total, the profit is locked in.
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Notes
Pinnacle prices are converted from American odds (1 / decimal odds). Pinnacle only offers "to win", so its prices appear in the Yes column.
Polymarket fee: shares × rate × p × (1 − p), using each market's rate. Kalshi fee: 0.07 × p × (1 − p), rounded up to the cent per order.
In tennis, "player does not win" can also be bought as the opponent winning.
Golf lists players priced at 1% or more. A sum under 1.000 does not account for sportsbook limits, settlement timing, or differences in how venues settle retirements and withdrawals.