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Toronto Blue Jays vs Seattle Mariners Pick - 5/10/2025

Toronto Blue Jays vs Seattle Mariners Game 3 Prediction – 10/15/2025

Updated October 15, 2025 • 3 min read

The Toronto Blue Jays and Seattle Mariners will meet in Game 3 of the ALCS on Wednesday night. Seattle has taken a 2-0 series lead by winning two straight games on the road. The Mariners will try to take a commanding 3-0 series lead tonight, while the Jays try to get back into the series. Before the first pitch is thrown in the Pacific Northwest, continue reading to get my Blue Jays vs Mariners Game 3 prediction.

Our Blue Jays vs Mariners Game 3 Pick

  • Pick: Mariners Moneyline
  • Confidence: ★★★★☆

Game Snapshot

  • Matchup: Toronto Blue Jays vs Seattle Mariners
  • Date & Time: Wednesday, October 15, 8:08 p.m. ET
  • Starting Pitchers:
    • Seattle: George Kirby
    • Toronto: Shane Bieber
  • Stadium: T-Mobile Park, Seattle, WA
  • Broadcast: FS1

Key Storylines

Pitching matchup

Seattle hands the ball to George Kirby, who has made two postseason appearances so far. He’s logged 10 innings with 14 strikeouts and a 2.70 ERA. Kirby generates enough swings and misses to be a threat to the Toronto lineup, but he has given up a home run in the playoffs previously and will try to avoid more hard contact in this game.

Toronto will go with Shane Bieber to start this must-win game. The Blue Jays acquired him midseason in hopes that he’d bolster their pitching rotation in situations like this one. He has struggled in the postseason thus far, with a 6.75 ERA in 2.2 innings of work. He will need to be much better than that for the Jays to win this game.

Key Players

  • Jorge Polanco (SEA): Polanco has delivered in the postseason, with multiple go-ahead hits already. Seattle will lean on his bat in this contest.
  • Julio Rodríguez (SEA): Always a dangerous bat, Julio Rodriguez can take over games for Seattle.
  • Cal Raleigh (SEA): The power threat of Raleigh remains important to Seattle’s offense in October. He has a home run in this series already and will look to do more damage.
  • George Springer (TOR): Springer hit a lead-off home run in Toronto earlier in the series. His team needs more of his contributions to avoid an 0-3 deficit.
  • Vladimir Guerrero Jr. (TOR): The heart of Toronto’s offense is Guerrero. If he gets going, the Blue Jays will have a chance.

Recent team streaks

  • Toronto has lost two straight games in this series and three of their last four games dating back to the ALDS.
  • The Mariners have won three straight games and four of their last five.

Best Player Props

Player PropOver / Under
George Kirby StrikeoutsOver 4.5
Jorge Polanco Total BasesOver 1.5
Alejandro Kirk Home RunYes

Betting Trends & H2H

  • These teams are 4-4 against each other between the regular season and playoffs.
  • The road team has won seven straight games between these two teams.
  • Games in this series are 1-1 on the over/under going into this contest.

Blue Jays vs Mariners Game 3 Model Projection

Score Projection: Seattle 5 – Toronto 3

Win Probability: Seattle 57%, Toronto 43%

Final Thoughts

Seattle has all the momentum in this series going into this game. They also have a better starting pitcher and more consistent hitters to rely on. I’ll take the Mariners to win Game 3 at home and move to within one game of getting to the World Series.


Jay Sanin

Jay Sanin is the GM and Head of Sports at ATS.io. He has been writing about sports gambling since 2013, handicapping tens of thousands of sporting events. He plays sides and totals aggressively across most sports and is more selective in player prop markets. He does his own modeling across most sports, and his family is jealous of how much time he spends on his precious spreadsheets.

Affiliate Disclosure ATS.io uses affiliate links. If you sign up through a link on this page, we may earn a commission at no additional cost to you. Rankings are based on hands-on testing and published criteria, and affiliate relationships do not determine placement.
Tags: Seattle Mariners, Toronto Blue Jays
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