Colorado Rockies vs Seattle Mariners Prediction 9/23/2025 Today’s MLB Picks

In this article, we will formulate a Rockies vs Mariners Prediction for this MLB game on Tuesday, September 23rd at the T-Mobile Park in the opening game of this series. Let’s take a look at the prediction for this MLB matchup.

Seattle Mariners Preview

The Seattle Mariners have an 87-69 record this season and are sitting on the second place of the AL West. The Mariners have a 48-27 home record and are 86-64 in over/under. They are coming off a 7-3 road victory over the Astros, and have eight consecutive wins. Over is 8-4 in their last 12 games and are playing the Dodgers next.

The Mariners have a .244 batting average this season, .320 OBP and .420 Slugging percentage. Seattle’s pitching staff has a 3.88 ERA and 1.23 WHIP. Julio Rodriguez leads the Mariners in hits with 171, and he is the team’s best hitter with a .268 batting average. Cal Raleigh leads the team both in RBI with 121, and in home runs with 58.

Bryce Miller (R) is the projected starting pitcher for the Mariners, and he has a 4-5 record, 5.58 ERA and 1.41 WHIP.

Colorado Rockies Preview

The Colorado Rockies have a 43-113 record this season and are sitting on the last place of the NL West. The Rockies have a 18-57 road record and are 69-82 in over/under. They are coming off a 3-1 home victory over the Angels, and are 2-6 in their last 8 games. Over is 6-2 in their last 8 games, and are playing the Giants next.

The Rockies have a .239 batting average this season, .295 OBP and .389 Slugging percentage. Colorado’s pitching staff has a 5.99 ERA and 1.59 WHIP. Hunter Goodman leads the Rockies with 144 hits, also leading the team both in RBI, with 88, and in home runs, with 30. He is also the team’s best hitter with a .279 batting average.

McCade Brown (R) is the projected starting pitcher for the Rockies, and he has a 0-4 record, 9.17 ERA and 2.09 WHIP.

Colorado Rockies @ Seattle Mariners Betting Trends: September 23, 2025

• Probable Starting Pitcher: Bryce Miller      Record this season: 4-5      ERA: 5.58
• Home Record: 2-2
• Last 5 against Rockies: –

Why the Seattle Mariners will win

• The Mariners have won 17 of their last 18 home games against teams that held a losing record.
• The Rockies have lost each of their last seven games following a win.
• The Rockies have failed to cover the run line in each of their last seven games following a win.
• The Mariners have covered the run line in seven of their last eight games.
• The Rockies have lost the first inning in four of their last five road games against American League opponents.
• The Mariners have led after 5 innings in eight of their last nine games.
• The Rockies have trailed after 3 innings in each of their last six road games.

• Probable Starting Pitcher: McCade Brown      Record this season: 0-4      ERA: 9.17
• Road Record: 0-2
• Last 5 against Mariners: –

Why the Colorado Rockies will win

• The road team has won each of the Mariners’ last four games.
• The Mariners have lost four of their last five home games against NL West opponents following a win.
• The road team has covered the run line in each of the Mariners’ last four games.
• The Mariners have failed to cover the run line each of their last four games against NL West opponents that held a losing record.
• The Mariners have trailed after 3 innings in each of their last four night games against NL West opponents.

Total Runs Facts

• Each of the Rockies’ last four road games against American League opponents have gone UNDER the total runs line.
• Each of the Mariners’ last four night games against NL West opponents have gone OVER the total runs line.
• The ‘Inning 1 OVER 0.5 runs’ market has hit in five of the Mariners’ last six night games.
• The ‘Inning 1 OVER 0.5 runs’ market has hit in nine of the Rockies’ last 11 games against American League opponents.

Seattle Mariners Player Prop Facts

• Bryce Miller has recorded four or more strikeouts in each of his eight previous home appearances against NL opponents.
• Cal Raleigh has hit a home run in each of the Mariners’ last two games.
• Jorge Polanco has recorded at least one Double in each of the Mariners’ last eight home games.
• Jorge Polanco has recorded at least one hit in each of the Mariners’ last 11 home games.

Colorado Rockies Player Prop Facts

• Kris Bryant has hit a home run in four of his last five Tuesday appearances against AL teams that held a winning record.
• Tyler Freeman has recorded at least one hit in each of his last 14 appearances against AL opponents that held a winning record.

Matchup/League Facts

• The Mariners rank 29th in the league for doubles this season (225).
• The Mariners rank 29th in the league for triples this season (9).
• The Rockies rank 30th in the league for on-base percentage this season (.295).
• The Rockies rank 30th in the league for walks this season (385).

Rockies vs Mariners Prediction

The Mariners are 5-1 in their last 6 head-to-head meetings against the Rockies, having won their last three meetings in Seattle. Under is 8-2 in their last 10 meetings.

The Mariners have the Astros three games behind them for the first place of the AL West, and are lucky enough to play their second to last series of the regular season against the Rockies. Miller has been mediocre at best for the Mariners this season, but Brown for the Rockies has been even worse. The Mariners have a superior bullpen and a better offense and I expect them to dominate this game and cover the runline.