Red Sox vs. Mariners Dunkel MLB Picks, Predictions and Prop Bets - Aug. 31

The Seattle Mariners carry a four-game losing streak into a home matchup versus the Boston Red Sox, at 6:45 p.m. ET on Monday. Payton Tolle (8-6, 3.09 ERA) will start for the Red Sox, who are 74-63 this season and third in the AL East. George Kirby (9-10, 4.02 ERA) is the expected starter for the Mariners, who are 64-73 and third in the AL West.

The Red Sox (-160) are moneyline favorites at home over the Mariners (+140). The game has an over/under of 8 runs.

Red Sox vs. Mariners Odds, Game Time

• Game day: Monday, August 31, 2026
• Game time: 6:45 p.m. ET
• Location: Boston, Massachusetts
• Stadium: Fenway Park
• Favorite: Red Sox (-160)
• Underdog: Mariners (+140)
• Over/under: 8

How to Watch Red Sox vs. Mariners

• TV Channel: NESN and SEAM
• Live Stream: Fubo (Watch for free)

Bet now on FanDuel Sportsbook!

Red Sox vs. Mariners: Betting the Moneyline

• The Red Sox have a 51-43 record in games they were listed as the moneyline favorite (winning 54.3% of those games).
• Seattle has been victorious in 11, or 34.4%, of the 32 contests it has been chosen as underdogs in this season.
• This season Boston has won 15 of its 23 games, or 65.2%, when favored by at least -160 on the moneyline.
• This season, the Mariners have come away with a win one times in three chances when named as an underdog of at least +140 or worse on the moneyline.
• Based on this matchup's moneyline, the Red Sox have an implied win probability of 61.5%.
• The Mariners have an implied victory probability of 41.7% according to the moneyline set for this matchup.

Red Sox vs. Mariners: Betting the Spread & Total

• In the 137 games in which oddsmakers have set an over/under for the Red Sox, they have combined with opponents to go over the total 63 times (63-69-5).
• Seattle and its opponents have gone over the total this season in 68 of its 137 opportunities.
• The Red Sox have put together a 68-69-0 record against the spread this season (covering 49.6% of the time).
• The Mariners are 51-86-0 against the spread in their 137 games with a line set by sportsbooks this season.