Live prediction market odds for Boston Red Sox vs. Seattle Mariners (4:10 PM ET). Compare prices across Kalshi and Polymarket.
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Kalshi / Polymarket
2026-06-21
Boston Red Sox vs. Seattle Mariners (4:10 PM ET) — MLB game scheduled for 2026-06-21. Compare live prediction market odds from Kalshi, Polymarket, and more on Prediction Hunt.
Seattle Mariners leads the “Boston Red Sox vs. Seattle Mariners (4:10 PM ET)” event at 56.8% implied probability, followed by Boston Red Sox at 43.3%. Platforms are tightly aligned at a 0.5% spread.
Boston Red Sox vs. Seattle Mariners (4:10 PM ET) is a prediction market event currently tracked across 2 platforms (Kalshi, Polymarket). Seattle Mariners leads at 57% implied probability, making it the market favorite. Other contenders include Boston Red Sox at 43%.
Seattle Mariners currently leads at 57% implied probability. Behind Seattle Mariners, Boston Red Sox at 43% are the next closest contenders. Platforms were tightly aligned at a 0.5% spread, suggesting broad consensus on the odds.
Here are the latest odds across Kalshi, Polymarket: Seattle Mariners: 57¢ on Kalshi, 57¢ on Polymarket. Boston Red Sox: 43¢ on Kalshi, 44¢ on Polymarket. Platforms are tightly aligned at a 0.5% spread, leaving little room for cross-platform arbitrage.
A price of 57¢ means the market estimates a 57% probability that Seattle Mariners will be the outcome. Buying one share at 57¢ pays out $1.00 if correct — a 75% return — or $0 if wrong. This is the core mechanic of prediction markets: the price directly reflects the crowd's probability estimate.
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Official settlement criteria, resolution sources, and edge cases across Kalshi and Polymarket.
KalshiIf Seattle wins the Boston vs Seattle professional baseball game originally scheduled for Jun 21, 2026 at 4:10 PM EDT, then the market resolves to Yes.
The following market refers to the Boston vs Seattle professional baseball game originally scheduled for Jun 21, 2026 at 4:10 PM EDT. If this game is postponed or delayed, the market will remain open and close after the rescheduled game has finished (within two days). If the game is cancelled or rescheduled to over two days away, the market will resolve to a fair price in accordance with the rules.
PolymarketIn the upcoming MLB game between the Boston Red Sox and Seattle Mariners, scheduled for June 21 at 4:10PM ET: This market will resolve to "Boston Red Sox" if the Boston Red Sox win the game. This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.
Seattle Mariners
56.8% avg
