The Seattle Mariners and Boston Red Sox wrap up a three-game set at Fenway Park with the first pitch of the rubber match set for 4:10 p.m. ET on Wednesday, Sept. 2.
While it’s been a high-scoring series through the first two games, my top Mariners vs. Red Sox predictions and MLB picks call for Boston to cash in as a home favorite while Seattle struggles at the dish.
Who will win Mariners vs Red Sox today: Red Sox moneyline (56.5%)
For help understanding probabilities, see our odds calculator.
The Seattle Mariners rank 29th in xwOBA with just 3.6 runs per game over the past 30 days, and starter Bryce Miller’s underlying numbers skyrocket away from pitcher-friendly T-Mobile Park.
His home 2.52 xERA and 3.67 xFIP jump to 3.80 and 4.04 marks, respectively, on the highway, where Miller has also surrendered a .346 wOBA and .239 ISO.
So, with the Boston Red Sox ranking second in wOBA, fourth in ISO and seventh in xwOBA while averaging 5.4 runs per game over the past 30 days, I’m happy to back them to 57.4% this afternoon.
COVERS INTEL: The Red Sox rank second in bullpen xERA and third in xFIP while pitching the third-most innings in the second half.
Mariners vs Red Sox Over/Under pick: Under 8.5 (51.2%)
While there’s no sugarcoating Boston starter Patrick Sandoval’s 5.32 xERA and 4.59 xFIP across his past seven starts, he’s still allowed two earned runs or fewer in six of those outings.
Additionally, I’m anticipating statistical correction to his .356 BABIP, the ninth-highest mark among all starters with at least 30 innings pitched during the stretch.
With the Mariners also ranking 30th in wOBA against lefties and 21st in wOBA on the highway, this Under 8.5 is in play to 53.5%.
Mariners vs Red Sox home run prediction: Wilyer Abreu (16.9%)
Red Sox outfielder Wilyer Abreu has a single homer across his past 16 games, and he's a ripe candidate to kick the skid tonight. Abreu has posted a high-end .213 ISO against right-handed pitchers, and Miller has a .236 ISO vs. left-handed hitters on the road.
- ML/RL bets: 48-21, +29.38 units
- Over/Under bets: 22-19, +1.74 units
Mariners vs Red Sox weather
The weather forecast calls for comfortable temperatures hovering around 72 degrees with a crosswind in the 11-mph range. The elements will have little impact at Fenway Park this afternoon.
Mariners vs Red Sox odds
- Moneyline: Mariners 46.5% | Red Sox 57.4%
- Run line: Mariners +1.5 (63%) | Red Sox -1.5 (40.8%)
- Over/Under: Over 8.5 (52.4%) | Under 8.5 (52.4%)
Mariners vs Red Sox trend
The Boston Red Sox have won 34 of their last 50 games (+12.85 Units / 18% ROI). Find more MLB betting trends for Mariners vs. Red Sox.
How to watch Mariners vs Red Sox and game info
| Location | Fenway Park, Boston, MA |
| Date | Wednesday, Sept. 2, 2026 |
| First pitch | 4:10 p.m. ET |
| TV | Mariners.TV, NESN |
| Mariners starting pitcher | Bryce Miller (4-8, 4.12 ERA) |
| Red Sox starting pitcher | Patrick Sandoval (1-3, 4.20 ERA) |
Mariners vs Red Sox latest injuries
Odds are correct at the time of publishing and are subject to change.
Not intended for use in MA.
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