Where and How to Watch Toronto Blue Jays vs. Seattle Mariners: Start Time, Channel, Prediction

The American League Championship Series continues as the Seattle Mariners host the Toronto Blue Jays in Game 4 on Thursday, October 16, 2025, live from T-Mobile Park. The series sits at 2-1 in Seattle’s favor, and a Mariners victory would push them to the brink of the World Series. Toronto, however, aims to level the series and regain momentum heading into Game 5.

This matchup features a marquee pitching duel, with Luis Castillo set to start for Seattle and Max Scherzer taking the mound for Toronto. Both teams bring potent lineups and postseason urgency to the stage, making this clash one of the most pivotal games of the series.

Game 4 Preview: Mariners vs. Blue Jays on FS1

Game 4 of the ALCS will air live on FS1 from Seattle’s T-Mobile Park. First pitch is scheduled for Thursday night, October 16. With the Mariners leading 2-1 in the series, the stakes are enormous — a win would give Seattle a commanding lead, while a Toronto victory would reset the series heading into Game 5.

The Mariners are favored slightly, listed at -135, while the Blue Jays enter as +114 underdogs. The over/under for total runs is set at 7.5, hinting at a potential offensive battle despite the strong pitching matchup.

Seattle will rely on its balanced roster, anchored by catcher Cal Raleigh, who blasted 60 home runs and drove in 125 runs during the regular season. Julio Rodríguez has been a consistent offensive force with 32 homers and 31 doubles, while Josh Naylor leads the team with a .295 batting average.

On the mound, Luis Castillo aims to contain Toronto’s power-heavy lineup. Castillo’s postseason experience and strikeout ability make him a key piece in Seattle’s push for its first AL pennant since 2001.

The Blue Jays counter with veteran ace Max Scherzer. Toronto’s offense, led by Vladimir Guerrero Jr. (.292 average, 23 homers) and George Springer (32 home runs), is averaging 7.3 runs per game over its last 10 contests. Ernie Clement and Alejandro Kirk add depth to a lineup that thrives under pressure.

What to Expect in Game 4

The Mariners enter Game 4 with a 5-5 record over their last 10 games and an average of four runs per game. Their pitching staff has posted a 4.27 ERA during that span, striking out 8.1 batters per nine innings. Toronto, meanwhile, is 7-3 in its last 10, averaging 7.3 runs per game and striking out 10.7 per nine innings.

Seattle’s offense will look to bounce back after a 13-4 loss in Game 3. Eugenio Suárez, who has 49 home runs on the season, remains a dangerous bat and could be a difference-maker. Rodríguez, who has hits in three consecutive games, is another player to watch.

Toronto’s lineup is firing on all cylinders after their Game 3 breakout. Guerrero Jr. and Springer headline a group that can change the game with one swing. If Scherzer delivers a vintage performance, the Blue Jays have a strong chance to even the series.

Most analysts predict a tight contest. A 5-4 Mariners win is a popular forecast, with the total expected to go over 7.5 runs. Seattle’s home-field advantage and balanced attack could be decisive, but Toronto’s playoff experience makes them a dangerous opponent.

With the series finely poised, Game 4 could determine the trajectory of the 2025 ALCS. Whether the Mariners seize control or the Blue Jays claw back, Thursday’s showdown promises drama, intensity, and October baseball at its finest.

FYI (keeping you in the loop)-

Q1: Where can I watch the Mariners vs. Blue Jays ALCS Game 4?

The game will air live on FS1 from T-Mobile Park in Seattle. Fans can also watch via participating cable and streaming platforms that carry FS1.

Q2: Who are the starting pitchers for Game 4?

Luis Castillo is expected to start for the Mariners, while Max Scherzer will take the mound for the Blue Jays in a crucial pitching matchup.

Q3: What is the current series score?

The Mariners lead the ALCS 2-1 heading into Game 4. A win would put them one victory away from the World Series, while the Blue Jays aim to tie it.

Q4: What is the score prediction for Mariners vs. Blue Jays Game 4?

Predictions lean toward a close game, with many expecting a 5-4 Mariners victory and the total runs exceeding 7.5.

Q5: Who are the key players to watch?

For Seattle, keep an eye on Cal Raleigh and Julio Rodríguez. For Toronto, Vladimir Guerrero Jr. and George Springer are expected to play major roles.