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ACLS Game 4 Preview: Mariners vs Blue Jays

Justin Carlucci

Justin Carlucci

Last updated: October 16, 2025

mariners vs blue jays props - alcs game 4 preview

The Blue Jays finally woke up in a big way yesterday. Since their offense is alive, it’s a great time to dive into some Mariners vs Blue Jays props for the ALCS Game 4!

We’ve got ourselves a swing game in Seattle tonight. The Mariners are up 2-1 and two wins away from their first-ever World Series appearance, but Toronto just dropped 13 runs on them at T-Mobile Park in Game 3.

The road team is a perfect 3-0 in this series, which should tell you everything about how this ALCS is playing out.

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Mariners vs Blue Jays Props – October 16

Luis Castillo takes the bump for Seattle in ALCS Game 4 against 41-year-old Max Scherzer, making his postseason debut for the Blue Jays. Let’s break down both sides before we get to the money plays.

Castillo has been sharp lately and threw 6 scoreless innings in the ALDS against Detroit with just 1 hit allowed.

Scherzer, the former Cy Young winner, struggled badly down the stretch and hasn’t pitched since September 24. Toronto left him off the ALDS roster entirely, and he hasn’t had playoff success in recent years.

Mariners Preview

Jorge Polanco has been unconsciously clutch this October—game-winning 15th-inning single in the ALDS, then go-ahead hits in Games 1 and 2 of this series, plus a three-run homer in Game 2. The guy teammates nicknamed “George Bonds” is living up to it.

Meanwhile, Cal Raleigh led MLB with 60 homers in the regular season and continues producing in October. He historically destroys Toronto pitching.

Mariners vs Blue Jays Props -  ALCS Game 4

The bullpen trio of Andrés Muñoz, Matt Brash, and Gabe Speier remains fresh after the others got lit up in Game 3. If Castillo works deep into this game, Seattle’s late-game weapons can shut the door.

Seattle went 53-31 at T-Mobile Park during the regular season, but the home crowd didn’t help in Game 3. They’re two wins from ending a 48-year World Series drought, but Toronto just proved home field means nothing.

Blue Jays Preview

Toronto’s offense was dead in the water through Games 1 and 2—just 4 total runs with Vlad Guerrero Jr. going 0-for-7.

Then manager John Schneider told his guys before Game 3: “Let’s try to have a few less jabs and a few more uppercuts.” Translation: stop being patient, start hunting early.

The results? 13 runs on 18 hits with 5 home runs in Game 3. Every single Toronto starter reached base. The turning point was Andrés Giménez batting ninth, crushing a two-run shot to tie it in the third. That opened the floodgates.

But the story is Guerrero going from 0-for-7 to 4-for-4 with a homer, two doubles, and a single in Game 3. He’s locked in now with multiple homers this postseason. When Vlad’s rolling, Toronto is nearly impossible to stop.

Alejandro Kirk went deep in Game 3 and has had success against Castillo historically. George Springer launched his 22nd career playoff homer in Game 3. This lineup can clearly score when they’re aggressive early in counts.

When looking at Mariners vs Blue Jays props, Kirk and Springer have been pretty good reverse-splits hitters, and Kirk is a low-strikeout guy. That makes them both appealing tonight.

Mariners vs Blue Jays Props: Expert Picks Today

Left-handed hitters have been demolishing Scherzer all season. The future Hall-of-Famer has allowed a monstrous .290 ISO and a near 15% barrel rate to LHB this year.

Mariners vs Blue Jays Props - ALCS Game 4 - Josh Naylor

This is a generous fantasy points projection for Naylor on Underdog Fantasy.

Naylor showed a little less pop vs. RHP this year, but still owns a .202 ISO against them dating back to last season.

The kicker is now he’s allegedly a threat to steal bases, who saw that coming? The left-handed bat is in a great spot vs. Scherzer at this low number.

All of these left-handed hitters are live to do damage for Seattle; it just depends on what price you’re willing to pay.

Of course, Raleigh and Polanco are in play in pretty much every way imaginable in the ALCS Game 4.

Mariners vs Blue Jays Props Pick: Josh Naylor Higher Than 6.5 Fantasy Points

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