Colorado Rockies vs Seattle Mariners Prediction and Picks - September 25, 2025
Thursday Night Major League Baseball action, 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 43-115. Seattle is red-hot, having won 16 of their last 17 games and have now officially clinched the American League West. Can the Mariners stay hot? Read on to see our Rockies vs Mariners prediction.
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The Rockies enter Thursday night’s matchup on the heels of a lopsided 9–2 loss, where their pitching faltered and the offense was nearly silent, managing just two hits. Colorado’s lone bright spot was a pair of runs scratched across late, but by then the game was well out of hand. That defeat continued a season-long theme of inconsistency, particularly in run prevention, as their staff has been one of the weakest in the National League. The loss underscored the need for better starts on the mound and more competitive at-bats throughout the order.
Taking the mound will be Bradley Blalock, a young right-hander whose numbers highlight the challenges he’s faced at this level. Carrying a high ERA and a WHIP over 1.80, Blalock has struggled to limit damage once baserunners reach. His stuff can generate swings and misses, but command lapses have hurt him against patient lineups. Against a Mariners club that thrives on punishing mistakes and works deep into counts, he will need to attack the strike zone early and keep the ball in the yard. Otherwise, Colorado risks falling behind quickly again.
For Colorado to have a chance, the offense must also do its part. Hunter Goodman has shown flashes of power, but the lineup as a whole has struggled to sustain rallies. The Rockies rank near the bottom of the league in runs per game, and their inability to capitalize with runners on base has cost them opportunities to compete. To stay in this game, they’ll need timely hitting against a tough Mariners bullpen and a clean defensive performance to avoid giving away free chances. Colorado’s path to an upset hinges on Blalock finding rhythm and the bats providing early support to ease the pressure.
Seattle Clinches The AL West
Seattle’s 9–2 win on Wednesday was more than just another victory—it officially clinched the AL West title, giving them their first division crown since 2001. The performance epitomized how complete this team has become, with Cal Raleigh once again leading the charge offensively. His two home runs, pushing his season total beyond 60, highlighted the historic power he has brought to the lineup. With contributions also coming from Julio Rodríguez and Jorge Polanco, the Mariners showcased the depth that has carried them through the season and now secured them a spot atop the division.
On the pitching side, Luis Castillo put together a masterpiece, tossing over seven innings of one-hit ball with double-digit strikeouts. His dominance set the tone, silencing Colorado’s lineup and keeping the bullpen fresh heading into Thursday’s series finale. The Mariners have built their identity around elite starting pitching paired with a reliable bullpen, and Castillo’s outing underscored the edge they’ll continue to bring into October. Even with the division locked up, Seattle remains focused on maintaining rhythm and sharpness as they transition toward postseason play.
Seattle’s formula for success has been consistent all season: aggressive power at the plate paired with disciplined pitching. With Raleigh’s power surge, Rodríguez’s all-around contributions, and steady production throughout the order, the Mariners are never reliant on one player to carry the load. Now that the AL West title is secured, the focus shifts to fine-tuning execution and keeping momentum strong. Against Colorado, they’ll look to keep applying early pressure, force Blalock into mistakes, and let their combination of star power and depth dictate the pace of the game.
Colorado Rockies vs Seattle Mariners Pick
Rockies vs Mariners Moneyline Pick
- Seattle -1.5 (4 Units)
Seattle -1.5 makes a lot of sense given the momentum they’re carrying and the matchup advantages on both sides of the ball. Clinching the AL West with Wednesday’s 9–2 win only adds confidence to a club that has been firing on all cylinders. The Mariners’ offense, powered by Cal Raleigh’s historic 60+ home run season and steady production from Julio Rodríguez and Jorge Polanco, has shown an ability to overwhelm weaker pitching staffs like Colorado’s. Against Bradley Blalock, who has struggled with command and enters with an ERA north of nine, Seattle’s patient and powerful lineup is in prime position to jump ahead early. Playing from behind would be a nightmare scenario for Colorado, and the Mariners have the firepower to create separation quickly.
On the mound, Seattle’s rotation continues to set the tone, with Luis Castillo’s gem on Wednesday keeping the bullpen rested and ready. Even if the Mariners don’t get the same length from Thursday’s starter, the relief corps has been reliable in closing out leads and preventing late rallies. Meanwhile, Colorado’s offense has been one of the least productive in baseball, managing just two hits in Wednesday’s loss and struggling to string together runs consistently. With the Rockies’ bullpen also prone to late-game struggles, Seattle holds a decisive edge across every phase. The ingredients for another multi-run victory are all there—dominant pitching depth, a potent lineup, and the confidence of a division champion—making the runline the sharper play.
Rockies vs Mariners Over/Under Pick
- Under 8 (5 Units)
The Under 8 looks like the right call here because while Seattle has the bats to do damage, they may not need a huge offensive output to secure another win. The Mariners’ pitching staff is in excellent shape after Luis Castillo’s dominant outing, leaving a fresh bullpen ready to shut down a Colorado lineup that has struggled all season and managed just two hits on Wednesday. Even if Seattle jumps on Bradley Blalock early, the Rockies’ lack of consistent offense makes a high-scoring game unlikely. With one side carrying most of the scoring burden and the other unlikely to contribute much, this matchup sets up well to finish below the 8-run total.
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