Toronto Blue Jays vs. Seattle Mariners ALCS Game 5 Preview: Key Matchups, Probable Pitchers, and Betting Odds – October 17, 2025

Friday, October 17th, 2025

Toronto Blue Jays at Seattle Mariners: 2025 ALCS Game 5 Preview

The Toronto Blue Jays (94-68, first in the AL East) and the Seattle Mariners (90-72, first in the AL West) face off in a pivotal Game 5 of the American League Championship Series at T-Mobile Park. With the series tied 2-2, both teams are aiming for a decisive win to gain the upper hand in the race to the World Series.

Game Information

Location: T-Mobile Park, Seattle
First pitch: Friday, 6:08 p.m. EDT

Pitching Matchup

The Blue Jays are sending Kevin Gausman (10-11, 3.59 ERA, 1.06 WHIP, 189 strikeouts) to the mound. The Mariners will counter with Bryce Miller (4-6, 5.68 ERA, 1.41 WHIP, 74 strikeouts). Oddsmakers have set the Blue Jays as slight favorites at -111, with the Mariners at -108. The over/under is set at 7 runs.

Weather

Today at T-Mobile Park, expect cool fall weather with temperatures around the mid-50s under mostly cloudy skies. There’s a minimal chance of precipitation, so rain delays are unlikely. Winds will be light, not significantly impacting play on the field. Overall, conditions look favorable for baseball.

Team Records & Season Series

Seattle holds a strong 51-30 home record and an overall mark of 90-72. The Mariners are especially effective when keeping opponents in the yard, holding a 38-16 record when not allowing a home run. Toronto went 40-41 away from home but posted an impressive 94-68 record overall, boasting a 73-15 record when collecting more hits than their opponent. The Blue Jays lead the season series 6-4, with this being their 11th meeting of 2025.

Players to Watch

Cal Raleigh has powered the Mariners’ lineup, hitting 60 home runs and slugging .589. Jorge Polanco has been a recent force, going 10-for-40 with four home runs and 11 RBI in his last 10 games.

For Toronto, Vladimir Guerrero Jr. continues to anchor the offense with 23 home runs, 81 walks, 84 RBI, and a .292 average. Ernie Clement is hot at the plate, going 17-for-37 with three doubles, a home run, and eight RBI over his last 10 appearances.

Recent Performance

The Mariners have gone 5-5 in their past 10 games, batting .209 with a 4.55 ERA, and have been outscored by 12 runs during that span. The Blue Jays are riding a 7-3 surge, batting .307 with a 4.15 ERA, and have outscored opponents by 34 runs over their last 10 games.

Injuries

Mariners: Jackson Kowar (shoulder – 15-Day IL), Trent Thornton (achilles – 60-Day IL), Gregory Santos (knee – 60-Day IL), Ryan Bliss (biceps – 60-Day IL).

Blue Jays: Jose Berrios (elbow – 15-Day IL), Ty France (oblique – 10-Day IL), Bo Bichette (knee – 10-Day IL), Robinson Pina (elbow – 60-Day IL), Nick Sandlin (elbow – 60-Day IL), Yimi Garcia (ankle – 60-Day IL), Bowden Francis (shoulder – 60-Day IL), Ryan Burr (shoulder – 60-Day IL), Angel Bastardo (elbow – 60-Day IL).

In summary

With the ALCS tied and the World Series within reach, the Toronto Blue Jays and Seattle Mariners are set for a crucial Game 5 showdown in Seattle. Fans can expect strong pitching matchups, standout hitters, and ideal fall weather conditions at T-Mobile Park. Given recent trends and individual performances, both teams bring strengths that could swing the series, making this matchup a must-watch for MLB fans.

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