Seattle Mariners (72-83) vs. Colorado Rockies (57-98) September 20, 2026 3:10 pm EDT The Line: Colorado Rockies 137 / Seattle Mariners -166; Over/Under: 11 (Get latest betting odds)
In this article, we will formulate a Mariners vs Rockies Prediction for this MLB matchup on Sunday, September 20 th in the third game of this series. Let’s take a look at the prediction for this MLB matchup.
The Colorado Rockies have a 57-98 record this season and are sitting in the 5th place of the NL West. They have a 32-45 home record and are coming off a 5-3 home win against the Mariners. They will face the Dbacks and the White Sox next.
The Colorado Rockies have a .255 batting average this season, .324 OBP and .417 Slugging percentage. Colorado’s pitching staff has a 5.60 ERA and 1.53 WHIP. TJ Rumfield is the team’s best hitter with a .302 batting average. Jake McCarthy leads the team in RBI with 83, while Hunter Goodman adds a team-high 38 home runs.
Tomoyuki Sugano (R) is the projected starting pitcher for the Rockies, and he has a 12-10 record, 5.49 ERA and 1.36 WHIP.
The Seattle Mariners have a 72-83 record this season and are sitting in the 3rd place of the AL West. They have a 32-48 away record and are coming off a 3-5 road loss against the Rockies. They will face the Astros and the Angels next.
The Seattle Mariners have a .232 batting average this season, .312 OBP and .382 Slugging percentage. Seattle’s pitching staff has a 4.21 ERA and 1.26 WHIP. Randy Arozarena is the team’s best hitter with a .281 batting average, adding a team-high 76 RBI and a team-high 26 home runs.
Kade Anderson (L) is the projected starting pitcher for the Mariners, and he has a 1-2 record, 5.33 ERA and 1.42 WHIP.
The Mariners are 8-2 in their last 10 meetings against the Rockies and have won two of their last three visits in Colorado.
In this Mariners vs Rockies Prediction, the Mariners are coming as -165 road favorites. The Mariners are almost mathematically eliminated from the playoffs and I don’t trust Kade Anderson and his 5.33 ERA and 1.42 WHIP. Sugano has been better at home and the Rockies have been excellent against lefties lately, scoring 8.2 runs in their last 5 against southpaws and also have a better bullpen ERA in that span. Take the Rockies at home for plus money in this one.