Seattle Mariners vs Toronto Blue Jays – MLB Preview – Oct 15, 2025

The American League Championship Series continues Wednesday night as the Seattle Mariners host the Toronto Blue Jays for Game 3. First pitch is set for 8:08 PM ET at T-Mobile Park. Seattle leads the best-of-seven series 2-0 after two strong road wins in Toronto. Oddsmakers list the Mariners as -135 favorites, with Toronto at +115 and the total at 7 runs.
Toronto comes into the night trying to stop the momentum after scoring only four runs through the first two games. Seattle’s lineup has been productive, plating 13 runs in the series so far. The Blue Jays were one of the best home-run-hitting teams during the season but have struggled to find consistency against Seattle’s pitching staff. The Mariners return to a park where they went 53-31 during the regular season.
Mariners Preview – Back Home With Control of the Series
The Mariners took both games in Toronto behind a mix of power hitting and solid pitching. In Game 1, Cal Raleigh hit a key home run in a 3-1 win. Game 2 saw Seattle’s bats break out for a 10-3 victory with homers from Julio RodrÃguez, Jorge Polanco, and Josh Naylor. The team returns to Seattle with confidence and the opportunity to take full command of the series.
George Kirby will start for the Mariners. He finished the regular season 10-8 with a 4.21 ERA. In the ALDS against Detroit, he gave up just three total runs in 10 innings while striking out 14. Kirby has struggled historically against Toronto with a 6.28 ERA in 14 1/3 innings but enters in better form this postseason. His control will be key, as he issued only one walk over two playoff starts so far.
Seattle’s bullpen remains one of its biggest strengths. The relief corps owns a 3.25 ERA and 1.11 WHIP overall, and a 2.29 ERA over the last three games. Andrés Muñoz and Matt Brash continue to shut down late innings, while Gabe Speier and Eduard Bazardo have handled setup duties. The group’s consistency could make the difference again if the game stays close into the seventh or eighth innings.
Offensively, Seattle’s order has been patient and productive. Polanco has seven hits over his last three playoff games, while RodrÃguez continues to be a spark with power and speed. Josh Naylor’s homer on Monday was his first of the postseason, and his presence in the middle of the order adds balance from the left side. With the crowd behind them, the Mariners will try to keep the offensive pressure on early against Bieber.
Blue Jays Preview – Trying to Spark the Offense
Toronto’s lineup has cooled off dramatically since their Division Series win over the Yankees. After averaging over eight runs per game in that series, they’ve scored just four total runs in this ALCS. The team’s power has gone quiet, and with key hitters like Bo Bichette (knee) and Ty France (oblique) sidelined, the Blue Jays need contributions from Vladimir Guerrero Jr. and Daulton Varsho to stay alive in this matchup.
Shane Bieber starts for Toronto in Game 3. The right-hander went 4-2 with a 3.57 ERA after returning midseason from Tommy John surgery. Bieber has a strong postseason track record, though he allowed three runs (two earned) in just 2.2 innings against the Yankees in his last outing. He has been sharp against Seattle in past seasons, posting a 2.30 ERA in seven career starts. Toronto will rely on him to give the bullpen a breather and slow down Seattle’s hot bats.
Toronto’s bullpen has seen heavy work lately and struggled in the early part of this series. Over the last three games, the relief staff owns a 5.02 ERA and 1.74 WHIP. Yimi GarcÃa, Jeff Hoffman, and Seranthony DomÃnguez are the top options late, but several arms have thrown multiple times in recent days. With Game 3 on the road, the Jays will need a strong start from Bieber to keep their relievers fresh.
The Blue Jays hit .241 as a team with a 4.22 ERA this season. They’ve shown flashes of offense, but the lack of clutch hitting has been costly. Toronto needs better production with runners in scoring position to have a chance in Seattle. The lineup will likely look to be more aggressive early in counts after being held in check by Mariners starters through two games.
Betting Prediction
Seattle’s combination of home-field advantage, bullpen depth, and recent offensive form makes them the more consistent play here. The Mariners’ lineup has found rhythm against Toronto’s pitching, while the Blue Jays’ bullpen issues continue to show. With Kirby’s control and Seattle’s defensive reliability, the matchup leans toward the home team.
Toronto’s best path to an upset would be a strong six or seven innings from Bieber and a few timely hits. However, given the Mariners’ 53-31 home record and the 8-2 Over trend in this matchup, a slightly higher-scoring game is likely. Look for both teams to score early, but Seattle’s bullpen should close the door late.
Projected Score: Mariners 5, Blue Jays 3
Pick: Seattle Mariners -135 and Over 7 (-110)
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