Mariners vs Red Sox Prediction and MLB Tips - 21 June 2026
Last updated: Jun 20, 2026, 4:41AM | Published: Jun 19, 2026, 6:44PM
The Seattle Mariners will face the Boston Red Sox in MLB action at T-Mobile Park on Sunday, beginning at 12:10pm AEST.
The Mariners will send Emerson Hancock (5-3, 3.28 ERA) to the mound, while the Red Sox are going with Connelly Early (5-5, 3.81 ERA).
This article features Stats Insider's prediction and tips for the Mariners vs Red Sox game, as well as the latest betting odds in Australia.
Who Will Win?
Based on trusted machine learning and data, Stats Insider has simulated the outcome of Sunday's Seattle vs Boston MLB game 10,000 times.
Our independent predictive analytics model currently gives the Mariners a 54% chance of beating the Red Sox at T-Mobile Park.
Mariners vs Red Sox: Odds
The latest betting odds in Australia for Sunday's MLB game at T-Mobile Park are shown here:
- Head to Head: Mariners $1.80, Red Sox $2.05
- Line: Mariners -1.5 ($2.65), Red Sox +1.5 ($1.50)
- Total (Over/Under 7.5 Runs): Over $1.91, Under $1.91
Odds are correct at the time of publication and subject to change.
Looking at the latest head-to-head odds, the bookmakers currently have the Mariners at $1.80 and the Red Sox at $2.05.
The Mariners are 1.5-run favourites against the Red Sox, with odds of $2.65 available at TAB.
For the underdog Red Sox (+1.5) to cover the line, TAB offers odds of $1.50.
The over/under for total runs scored is set at 7.5 with TAB, which has odds of $1.91 for the over and $1.91 for the under.
According to Stats Insider's model, the Red Sox (+1.5) are predicted to cover the line 63% of the time, while the 7.5-run over/under is expected to is considered an equal 50-50 chance of hitting.
Mariners vs Red Sox: Betting Tips
- Head to Head: Seattle at $1.80 with TAB
- Line: Mariners -1.5 at $2.65 with TAB
- Total Runs: Over 7.5 at $1.91 with TAB
These Mariners vs Red Sox predictions are based on market-leading simulations and gambling intelligence to give you the best possible advice every time.
Although the Red Sox are more likely to cover the line, our best bet of Mariners -1.5 is based on the probability of that happening, as projected by our predictive analytics model, and the best odds available.
Mariners vs Red Sox: Prediction
Stats Insider provides full betting coverage of the Seattle vs Boston game on Sunday, including data-driven predictions and live win probabilitiestips.
Our model updates frequently, so refresh this page for the latest betting analysis before the Seattle vs Boston game.
As always, see our Best Bets for betting tips on every MLB game, plus predictions for a wide range of other sports.
Mariners vs Red Sox: Essential Details
The game between the Mariners and Red Sox at T-Mobile Park is scheduled to begin at 12:10pm AEST on Sunday.
- Teams: Seattle Mariners vs Boston Red Sox
- Date: Sunday 21 June 2026
- Time: 12:10pm AEST
- Venue: T-Mobile Park
All dates and times mentioned in this article are in Australian Eastern Standard Time (AEST), unless otherwise stated.
Conclusion
Our Seattle vs Boston predictions have been made after running 10,000 data-driven simulations of the game, carefully curated by our team of experienced data scientists and analysts. We use the latest in predictive analytics technology and machine learning to ensure our MLB tips are trustworthy and reliable, giving you the knowledge you need to make informed decisions with confidence.
If you decide to use our MLB predictions for betting purposes, it's important to gamble responsibly and keep track of your money. For free and confidential support, call 1800 858 858 or visit gamblinghelponline.org.au.
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