Spread: Seattle Mariners (-8.5)

Prediction market on polymarket. In the upcoming MLB game between the Seattle Mariners and Houston Astros, scheduled for May 12 at 8:10 PM ET: This market will resolve to "Seattle Mariners" if the Seattle Mariners win the game by 9 or more runs. Otherwise, this market will resolve to "Houston Astros". If the game ends in a tie, this market will resolve to "Houston Astros". 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, this market will resolve 50-50. To know when a postponed game will be played, please check the home team's schedule on MLB.com for the listed team and look for the game described as a makeup game. 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.

24h Volume: $58. Resolves: 5/13/2026.