The Toronto Blue Jays and Seattle Mariners will bring the series west. The Jays will be desperate to pick up their first win, while Seattle can end this series without having to travel back to Canada.
Here are my Blue Jays vs. Mariners predictions and MLB player props for Wednesday, October 15.
Blue Jays vs Mariners Game 3 props
| Player |  |
|---|---|
 Jorge Polanco Over 1.5 hits + runs + RBI |
+105 |
| George Kirby Over 4.5 strikeouts |
-115 |
 Alejandro Kirk to hit a home run |
+750 |
Blue Jays vs Mariners player prop picks
Prop #1: Jorge Polanco Over 1.5 hits + runs + RBI
It’s been quite a postseason for Jorge Polanco. In fact, he’s done some things that have never been done before. After Game 2 of this series, he became the first player in MLB history to record a go-ahead hit in the fifth inning or later in three consecutive postseason games — the very definition of clutch. I like him to stay hot in this matchup.
The fact that he has strong lifetime numbers against Toronto Blue Jays veteran pitcher Shane Bieber is a nice starting point. He’ll enter this matchup with 31 plate appearances against him, a .276 slugging percentage, and a .296 expected batting average. These numbers look even better considering how well he's hitting right now.
I also like how he projects against this version of Bieber, given the current pitching arsenal he’s using. I’d play this down to -110.
Prop #2: George Kirby Over 4.5 strikeouts
Given how many times I’ve mentioned the east-to-west coast strikeout betting angle I’ve had success targeting, I don’t think I need to go through it again. However, we have that angle at play in this matchup, and it doesn’t feel like it’s being accounted for enough in this line. The BAT X would agree, projecting just over six strikeouts, and I'm following that belief.
I’ve mentioned often this postseason how difficult the Jays are to face because they simply don’t strike out, but you have to wonder about that aspect with a team that’s no doubt going to be pressing. There are no good strikeout matchups for opposing pitchers against Toronto, but this is at least a decent one for Seattle Mariners starter George Kirby.
He's posted a whiff rate over 32% with his slider this season, and if you’re looking for any pitch the Jays tend to whiff on, it’s that one. The situational aspect is the main contributing factor, but that’s a nice cherry on top.
Prop #3: Alejandro Kirk to hit a home run
This is quite a price for a player with such a good matchup and hitting the ball hard over the last few games.
In this series, Kirk has already managed two batted balls with exit velocities over 95 mph — not insanely hard, but worth noting, particularly considering one would have been a home run in a few ballparks. He opened these playoffs with two homers against the Yankees but has been relatively quiet since. He now steps into a ballpark where he's had success over the past few seasons.
The key is the pitching arsenal he’ll see from Kirby. He throws an array of pitches but primarily sticks to three: the fastball, slider, and sinker. He’s relied on those even more in the postseason, so I’d be surprised if he deviated. That’s great news for Kirk, as he’s the only Jays player ranking in the Top 4 in hard-hit rate against those three pitches. At this price point, I’ll bite.
How to watch Blue Jays vs Mariners and Game 3 info
| Location | T-Mobile Field, Seattle, WA |
| Date | Wednesday, October 15, 2025 |
| First pitch | 8:08 p.m. ET |
| TV | FS1 |
Odds are correct at the time of publishing and are subject to change.
Not intended for use in MA.
Affiliate Disclosure: Our team of experts has thoroughly researched and handpicked each product that appears on our website. We may receive compensation if you sign up through our links.
