The Seattle Mariners will host the Colorado Rockies at T-Mobile Park on Thursday night. The Mariners clinched the AL West title last night against a Rockies team with the worst record in baseball. But Seattle still has plenty to play for as they are in contention to finish the regular season with the best record in the American League. Before these teams take the field on Thursday, continue reading to find my Rockies vs Mariners prediction below.

Our Rockies vs Mariners PickPick: Mariners -1.5Confidence: 4/5Game SnapshotMatchup: Colorado Rockies vs Seattle MarinersDate & Time: Thursday, September 25, 2025, 9:40 PM EDTStarting Pitchers: Bradley Blalock (COL) vs Undecided (SEA)Stadium: T-Mobile Park, Seattle, WABroadcast: ROOT Northwest, Rockies.TVKey StorylinesPitching Matchup

Bradley Blalock (2-5, 9.16 ERA) will take the mound for the Rockies in this game. The rookie right-hander has faced challenges this season, allowing 79 hits and 16 home runs over 55 innings. His ERA reflects the difficulties he’s encountered against major league hitters. Against a Mariners lineup filled with power bats, tonight could be a bad night for Blalock.

The Mariners have not announced their starting pitcher for this game. Given that their playoff berth is secured, they may opt for a bullpen game or rest key starters. But whoever is starting for the Mariners tonight has an opportunity to make a good impression before the postseason.

Key PlayersCal Raleigh (SEA): The Mariners’ catcher recently became the seventh player in MLB history to hit 60 home runs in a season. He is leading the league with 125 RBI.Julio Rodríguez (SEA): Rodriguez went deep last night to help the Mariners clinch their division and will be important to their success tonight as well.Hunter Goodman (COL): The Rockies’ standout has 30 home runs and a .277 batting average. He is a rare bright spot in Colorado’s lineup.Recent Team Streaks

The Mariners have been dominant, winning 16 of their last 17 games, including a 9-2 victory over the Rockies last night. Their offense is firing on all cylinders, and their pitching staff has been effective in limiting opponents. The Rockies have struggled throughout the season, now holding a 43-115 record. They have lost two games in a row entering this series finale.

Best Player PropsPlayerPropCal RaleighOver 0.5 Home RunsHunter GoodmanOver 1.5 Total BasesJulio RodríguezOver 1.5 Total BasesBetting Trends & H2HThe Mariners are 2-0 against the Rockies this season.This is the final game these teams will play against each other in 2025.The Rockies have struggled on the road with an 18-59 away record.Seattle is 50-27 at home on the year.Rockies vs Mariners Model ProjectionScore Projection: Rockies 3 – Mariners 6Win Probability: Mariners 85%, Rockies 15%Final Thoughts

Some teams rest on their laurels shortly after clinching a division title. But I don’t think we will see that from the Mariners tonight. Seattle still has playoff seeding to play for and Cal Raleigh is going to try and pad his numbers to help his cause in the AL MVP race. I think we will see the Mariners win and cover the runline at home in this series finale.

Jay Sanin

Jay Sanin is a sports bettor, writer and broadcaster from New York. He is an avid New York Knicks fan and is no longer ashamed to admit it. He is also an avid New York Giants fan, and is very ashamed to admit it. His top sports to handicap are the NBA, WNBA and men’s tennis for some reason. He has watched more UAlbany Great Danes basketball than anyone should consume.

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