Boston Red Sox (30-43) vs. Seattle Mariners (39-38) June 20, 2026 10:10 pm EDT The Line: Seattle Mariners -126 / Boston Red Sox 104; Over/Under: 7.5 (Get latest betting odds)
In this article, we will formulate a Red Sox vs Mariners Prediction for this MLB matchup on Saturday, June 20 th in the second game of this series. Let’s take a look at the prediction for this MLB matchup.
The Seattle Mariners have a 39-38 record this season and are sitting in the 1st place of the AL West. They have a 21-18 home record and are coming off a 2-6 home defeat against the Red Sox. They will face the Pirates and the Guardians next.
The Mariners have a .234 batting average this season, .314 OBP and .391 Slugging percentage. Seattle’s pitching staff has a 3.64 ERA and 1.18 WHIP. Randy Arozarena is the team’s best hitter with a .291 batting average. Julio Rodriguez leads the team in RBI with 37, while Luke Raley adds a team-high 14 home runs.
Emerson Hancock (R) is the projected starting pitcher for the Mariners, and he has a 5-3 record, 3.28 ERA and 1.02 WHIP.
The Boston Red Sox have a 30-43 record this season and are sitting in the 5th place of the AL East. They have a 18-18 road record and are coming off a 6-2 road win against the Mariners. They will face the Rockies and the Yankees next.
The Red Sox have a .245 batting average this season, .312 OBP and .383 Slugging percentage. Boston’s pitching staff has a 3.90 ERA and 1.27 WHIP. Willson Contreras is the team’s best hitter with a .289 batting average, also leading the team in RBI with 44 and adding a team-high 16 home runs.
Connelly Early (L) is the projected starting pitcher for the Red Sox, and he has a 5-5 record, 3.81 ERA and 1.32 WHIP.
The Red Sox are 3-1 in their last 4 meetings against the Mariners and are 3-1 in their last 4 visits in Seattle.
In this Red Sox vs Mariners Prediction, the Mariners are coming as -130 home favorites. I like the Mariners in a bounce-back spot today. Hancock has been very good at home with a 2.70 ERA, while Connelly Early has been struggling lately with a 7.36 ERA across his last three starts and the Red Sox have the second-worst offense in baseball this season. Take the Mariners in this one.