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MLB Prop Bets: Boston Red Sox vs Seattle Mariners (September 2, 2026)

The Seattle Mariners (65-74) face the Boston Red Sox (75-64) at Fenway Park on Wednesday at 4:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Bryce Miller is the probable pitcher for the Mariners, while Patrick Sandoval is the probable pitcher for the Red Sox. The Red Sox are favored to win at -136, while the Mariners are at +113. The total runs line is set at 8.5, with OVER at -110 and UNDER at -110.

  • The Mariners (-186) have a 55-84 Run Line record this season, while the Red Sox (+153) hold a record of 67-72.
  • The Mariners have a 70-61-8 O/U record this season (meaning 70 games have gone over the total runs line, 61 have gone under and eight have resulted in a push). The Red Sox have a 66-69-4 O/U record.

Scoring Insights

  • The Mariners are averaging 3.9 runs per game this season (30th in the league). Comparatively, the Red Sox are averaging +0.6 more at 4.5 runs (16th).
  • In the field, the Mariners are allowing 4.4 runs per game this season (15th in the league), while the Red Sox are allowing an average of 3.9 runs (5th).

Let's take a look at how these teams perform in some other key statistical areas.

Batting Insights:

Batting Average

  • Looking at their batting averages this season, the Mariners are at .228 (ranking 29th in the Major leagues), while the Red Sox are batting .250 (7th).

Home Runs

  • In terms of total home runs this season, the Red Sox have hit 142 (T23rd in the Major Leagues). Meanwhile, the Mariners have managed 162 (T12th).

Runs Batted In

  • Finally, looking at their runs batted in, the Mariners have recorded 528 RBIs to rank 29th in the MLB this season. Comparatively, the Red Sox have recorded 595 RBIs to rank T14th.

Pitching Insights:

Earned Run Average

  • The Red Sox have an earned run average of 3.64 this season (6th in the Majors), while The Mariners have an ERA of 4.19 (19th).

Strikeouts

  • Turning our attention to total strikeouts, the Mariners have recorded 1173 this season, ranking 13th in the MLB. Meanwhile, the Red Sox rank 11th for total strikeouts, recording 1187.

Opponent Batting Average

  • Opponents are batting an average of .242 against the Red Sox this season (16th in the Major Leagues). Comparatively, the Mariners' opponents are at .250 (22nd).

First Innings Moneyline

  • Here are their first innings moneyline records in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Mariners 33-37-69 20-16-32 13-21-37 26-25-52 7-12-17 0-0-0 3-3-4
    Red Sox 30-39-70 18-17-33 12-22-37 21-25-49 9-14-21 0-0-0 1-2-7

Lead After Three Innings

  • Here are their records after the first three innings in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Mariners 56-53-30 31-22-15 25-31-15 40-37-26 16-16-4 0-0-0 4-5-1
    Red Sox 58-52-29 34-23-11 24-29-18 44-32-19 14-20-10 0-0-0 3-6-1

NRFI/YRFI

  • The NRFI is 62-77 in Mariners games this season. The Red Sox have a 66-73 NRFI record.

Last Time They Met

The Mariners recorded a 9-6 victory over the Red Sox at Fenway Park yesterday. Lazaro Montes was unstoppable in that matchup, hitting a home run, a single and recording 2 RBIs.