| MATCHUP | Boston Red Sox | Seattle Mariners |
|---|---|---|
| Team Records | 30-43 | 39-38 |
| Spread | +1.5 -207 | -1.5 169 |
| Moneyline | +105 | -126 |
| Total | Over 7 (-124) | Under 7 (103) |
| Where | T-Mobile Park, Seattle, Washington | |
| When | Saturday, June 20, 2026 | |
| Time | 10:10 PM EDT | |
| TV | MLB.TV | |
The Boston Red Sox and the Seattle Mariners meet Saturday in MLB action from T-Mobile Park. We will look at this from a betting perspective and determine the best bets for this game. Here’s a Boston Red Sox vs. Seattle Mariners prediction.
Starting Pitching Matchup
The Boston Red Sox will send out Connelly Early for the start here and Early is 5-5 with a 3.81 ERA and 72 strikeouts this season. Seattle will trot out Emerson Hancock here and Hancock is 5-3 with a 3.28 ERA and 75 strikeouts this season.
Boston Red Sox Recap
The Boston Red Sox come into this game looking to add on to their 6-2 win over Seattle from Friday to improve to 30-43 this season. After this series, the Red Sox will head on the road for a series against the Colorado Rockies.
Red Sox Snap Four-Game Slide
Entering Friday, Wilyer Abreu leads the Red Sox with 76 hits including 16 doubles, a triple, 8 home runs and 34 RBIs while Trevor Story has 34 hits with 7 doubles, 3 homers and 19 RBIs and Marcelo Mayer’s added 40 hits with 7 doubles, 3 home runs and 18 RBIs as well. Roman Anthony has 25 hits with 5 doubles, a triple, a home run and 5 RBIs so far this season while Jarren Duran has 57 hits with 9 doubles, 12 home runs and 37 RBIs as well this season. Willson Contreras has added 72 hits with 11 doubles, 16 homers and 44 RBIs of his own on the year.
Seattle Mariners Recap
The Seattle Mariners come into this game looking to shake off a loss at the hands of the Red Sox last time out to sit at 39-38 this year. After this series, the Mariners will head on the road for a series against the Pittsburgh Pirates.
Mariners Alternate Wins & Losses In 5 Straight
Going into Friday, Luke Raley has 14 home runs and 35 RBIs this season. Cole Young’s added 70 hits with 10 doubles, a triple, 6 home runs and 33 RBIs and Cal Raleigh has 28 hits with 4 doubles, 7 home runs and 20 RBIs as well this season. Randy Arozarena has 76 hits with 18 doubles, 7 home runs and 33 RBIs as well on the year. Josh Naylor also has 68 hits with 8 home runs and 32 RBIs as well on the year. Julio Rodriguez has also added 75 hits with 15 doubles, 13 home runs and 36 RBIs.
Boston Red Sox @ Seattle Mariners Betting Trends: June 20, 2026
- Probable Starting Pitcher: Emerson Hancock Record this season: 5-3 ERA: 3.28
- Home Record: 2-1
- Last 5 against Red Sox: 1-0
Why the Seattle Mariners will win
- The Mariners have won each of their last 10 night games against the Red Sox following a home loss.
- The Red Sox have lost 14 of their last 15 Saturday night games against AL West opponents.
- The Red Sox have failed to cover the run line in five of their last six games against AL West opponents following a win.
- The Mariners have covered the run line in four of their last five games against the Red Sox following a loss.
- The Red Sox have lost the first inning in four of their last five road games against AL West opponents.
- The Red Sox have trailed after 3 innings in four of their last five games.
- The Red Sox have trailed after 5 innings in four of their last five games.
- Probable Starting Pitcher: Connelly Early Record this season: 5-5 ERA: 3.81
- Road Record: 3-1
- Last 5 against Mariners: –
Why the Boston Red Sox will win
- The underdogs have won four of the Red Sox’s last five games.
- The Mariners have lost 12 of their last 16 games as favorites against AL East opponents.
- The Red Sox have covered the run line in each of their last nine Saturday games as road underdogs against American League opponents.
- The Mariners have failed to cover the run line in each of their last six Saturday night games against American League opponents.
- The Mariners have trailed after 3 innings in 11 of their last 14 games as favorites against AL East opponents.
- The Red Sox have led after 5 innings in six of their last seven games at T-Mobile Park against opponents that held a winning record.
Total Runs Facts
- Each of the Red Sox’s last four games against AL West opponents have gone OVER the total runs line.
- Each of the Mariners’ last four night games after playing the previous day have gone OVER the total runs line.
- There has been at least one run scored in the first inning in seven of the Red Sox’s last eight road games against AL West opponents.
- There has been at least one run scored in the first inning in 17 of the Mariners’ last 20 games as home favorites against American League opponents.
Seattle Mariners Player Prop Facts
- Julio Rodriguez has recorded at least one hit in each of his last 19 home appearances against AL opponents.
- Patrick Wisdom has hit a home run in two of his last three home appearances against the Red Sox.
Boston Red Sox Player Prop Facts
- Willson Contreras has recorded at least one hit in each of the Red Sox’s last nine games against AL West opponents.
- Triston Casas has hit a home run in each of his last three appearances in night games against AL West teams that held a winning record.
Matchup/League Facts
- The Mariners rank 1st in the league for walks allowed this season (196).
- The Mariners rank 28th in the league for doubles this season (98).
- The Red Sox rank 30th in the league for RBIs this season (276).
- The Red Sox rank 29th in the league for runs scored this season (288).
Boston Red Sox vs. Seattle Mariners Prediction
I’m on the Mariners here. The Mariners were stifled by Ranger Suarez on Friday but Suarez is fully capable of what we saw on Friday with a no-hitter deep into the game. That being said I don’t really have the same expectations for Connelly Early and Hancock has had a lot of his success at T-Mobile Park this season. I’m rocking with the Mariners in this one.