Colorado Rockies vs Seattle Mariners Prediction and Picks - September 24, 2025
Major League Baseball action on Wednesday night, and we have a Colorado Rockies vs Seattle Mariners Prediction ready to rock and roll. The Rockies come in with the worst record in the league at 43-114. Seattle is red-hot, having won 15 of their last 16 games and now leads the American League West by four games over the Astros. Seattle has alsso clinched a playoff berth with Tuesday's 4-3 win. Can the Mariners stay hot? Read on to see our Rockies vs Mariners prediction.
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And Yet Another Loss By The Rockies
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The Rockies came painfully close to pulling off a road win on Tuesday, leading 3–1 heading into the eighth inning before their bullpen faltered in a 4–3 loss. Rookie starter McCade Brown gave Colorado everything they could have hoped for, striking out 10 batters across five strong innings and limiting Seattle to a single run. The offense scratched together just enough support, with timely hits and an aggressive approach on the bases that put them in position to steal a game against a playoff-bound opponent. Unfortunately, the late innings once again proved their undoing, as walks, hit batters, and a lack of command opened the door for Seattle’s comeback.
For Wednesday’s matchup, the Rockies are expected to turn to right-hander Tanner Gordon, who has endured a difficult season with a 6–7 record and an ERA hovering around 6.00. Gordon has shown flashes of promise but has struggled to consistently work deep into games, often leaving the bullpen exposed by the middle innings. Against a disciplined Seattle lineup, the margin for error will be slim, and Gordon’s ability to locate his fastball and secondary pitches will determine how long he can keep his team competitive.
Offensively, Colorado will need contributions from its supporting cast to offset a lineup that has lacked consistency. Situational hitting will be key, as they may not have many opportunities against Seattle’s starter. If the Rockies can find a way to cash in runners in scoring position early, it could relieve some pressure from the pitching staff. Still, after Tuesday’s collapse, the bullpen will be under a spotlight, and the team must prove it can hold a lead against one of the league’s hottest squads.
Mariners Clinch Playoff Berth
Seattle extended its late-season surge with a thrilling 4–3 victory on Tuesday, clinching a playoff berth in front of the home crowd. Trailing 3–1 in the eighth inning, the Mariners mounted a comeback by capitalizing on Colorado’s bullpen struggles, with Josh Naylor delivering the decisive bases-clearing double that flipped the game. The rally underscored Seattle’s resilience and ability to generate offense even on nights when hits are hard to come by. Their bullpen then shut the door, with clean work in the final two innings to preserve yet another close win.
On Wednesday, the Mariners will hand the ball to Luis Castillo, who has been a steady anchor for the rotation this season. Castillo enters with double-digit wins and an ERA in the mid-3s, reflecting his ability to manage traffic and keep opponents off balance. His combination of strikeout stuff and poise in big moments makes him the clear advantage in this pitching matchup, and Seattle will look for him to set the tone by working deep into the game. If Castillo is sharp, the Mariners should be well positioned to control tempo from the outset.
Beyond pitching, Seattle’s lineup has shown an ability to wear down opponents with patient at-bats and timely hitting. Players like Naylor and Cal Raleigh have come through in clutch situations, and their depth has proven difficult for opposing pitchers to navigate. Combined with a bullpen that has been reliable throughout September, the Mariners have the formula to stay in control, especially at home where they’ve thrived down the stretch. With momentum and confidence on their side, Seattle will aim to keep their winning ways rolling into October.
Colorado Rockies vs Seattle Mariners Pick
Rockies vs Mariners Moneyline Pick
- Seattle -1.5 (4 Units)
Seattle enters this matchup with all the momentum, not only clinching a postseason spot on Tuesday but also riding one of the hottest stretches in baseball. With Luis Castillo on the mound, the Mariners hold a decisive edge in the pitching matchup, as his track record of keeping hitters off balance should allow him to neutralize a Rockies lineup that has struggled to score consistently on the road. The Mariners’ offense doesn’t need an outburst to cover the runline — they’ve shown the ability to chip away and then deliver big hits late, just as they did in Tuesday’s eighth-inning rally. Against a shaky Colorado pitching staff, Seattle has multiple paths to pulling ahead by more than one run.
On the other side, Colorado’s vulnerabilities align poorly with Seattle’s strengths. Tanner Gordon has labored throughout the season, often unable to escape trouble when facing deep lineups, and his short outings have forced Colorado’s unreliable bullpen into too many high-leverage situations. That bullpen collapsed on Tuesday, and with the Mariners consistently finding ways to create offense in late innings, it’s hard to see the Rockies holding up for nine frames. With Castillo setting the tone and the Mariners’ relief corps ready to finish strong, the setup favors another multi-run victory at home, making Seattle -1.5 the sharp play.
Rockies vs Mariners Over/Under Pick
- Under (5 Units)
The Under looks like a strong angle here, even without an official line posted yet. Tuesday’s game stayed tight until the late innings, and Wednesday’s pitching matchup sets up for another low-scoring affair. Luis Castillo has been reliable all season, limiting hard contact and consistently working deep into games, while Colorado’s offense has shown little ability to string together rallies, especially away from Coors Field. On the other side, while Tanner Gordon has struggled overall, he faces a Seattle lineup that tends to lean on timely hits rather than explosive run totals, and the Mariners may not need more than a few runs to secure another win. With both teams likely to lean on their bullpens in a controlled way and playoff-level intensity keeping every run at a premium, this matchup has the makings of a game that stays well under six runs.
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