Red Sox vs Mariners: Prediction, Odds & Best Bets (July 31)

Nate Hornung

Written by: Nate Hornung

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Red Sox vs Mariners: Prediction, Odds & Best Bets (July 31) cover


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The Red Sox and Mariners play tonight at T-Mobile Park in the first game of their season series finale.

The teams face off in Seattle, but saw each other at Fenway Park in mid-May.

In that series, the Red Sox won two out of three, and we saw plenty of runs.

Each game saw double digit runs with the Mariners winning 10-1, followed by the Red Sox winning 9-4 and 12-3 the next two days.

George Kirby is on the mound for the Mariners, and he already has a great outing against this Red Sox lineup.

Let’s breakdown tonight’s game!

Red Sox vs Mariners Game Information

Matchup Information

  • Venue & Location: T-Mobile Park (Seattle, WA)
  • Date: Monday, July 31st, 2023
  • First Pitch: 9:40pm Eastern
  • Broadcast: ROOT Sports MW

Pitching Matchup

  • Boston Red Sox: Nick Pivetta (7-5, 4.11 ERA)
  • Seattle Mariners: George Kirby (9-8, 3.49 ERA)

Betting Odds

Odds courtesy of Bovada.


  • Red Sox +1.5 (-195)
  • Mariners -1.5 (+165)


  • Red Sox +108
  • Mariners -130


  • Over 7.5 (-105)
  • Under 7.5 (-115)
Red Sox Mariners Prediction Best Bets July 31

George Kirby already faced Boston, and he pitched 6.2 innings, giving up just 1 run on 8 hits. He struck out 6 batters on his way to another Seattle victory.

Nick Pivetta also pitched against the Mariners, but his start was less memorable. He lasted 5.1 innings and gave up 4 earned runs on 6 hits. Pivetta walked 4 and struck out 6.

He picked up the win thanks to 3 runs in the bottom of the 5th from the Red Sox, and Boston won 9-4.

Because of Kirby’s success against the Red Sox, I lean with the Mariners at home tonight.

This is a classic Red Sox bat against Kirby’s pitching matchup, and despite recent struggles, I like him to shove tonight at home.

The Pick: Mariners -1.5 (+165) Bovada

Player Props

George Kirby Under 2.5 Earned Runs (-130) BetOnline

Red Sox Mariners Prediction Best Bets July 31

Despite 5 Earned Runs last start, Kirby has still stayed under this number in 3 of his last 5 outings.

Boston’s bats are good, but Kirby has seen this lineup, he shut them down before, and I think he does it again at home.

Nearly all of Kirby’s stats improve at T-Mobile Park. His WHIP drops from 1.08 to 0.95. His ERA from 3.49 to 3.38, and opponent’s batting average drops from .254 to .228.

He simply is more comfortable at home, but he already tore this team up on the road.

At home tonight, I love Kirby to stay cool and collected and lead the Mariners to victory.

Eugenio Suarez Hit (-150) Bovada

Red Sox Mariners Prediction Best Bets July 31

We’re paying the juiceman here and I’ve got faith in Eugenio.

He bats .227 against RHP, and Pivetta allows those hitters to bat .202.

Against Pivetta, Suarez has 10 plate appearances.

He has two walks, and 2 hits, including a home run. He bats .250 against Pivetta, and batting 3rd for Seattle, I think he should knock one base tonight.

Suarez has a hit in 60% of games this season, including 19 of his last 30, and 10 of his last 13.

He had two base knocks last night in Arizona, so I see him doing it again tonight at home.

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Nate Hornung
Nate Hornung

Nate has been a recreational sports bettor for about 5 years. In that time, he has grown to love the pursuit of winners and sticking it to The Man. Nate loves data and uses his understanding of numbers to help him be a more profitable sports gambler, however he will be the first to tell you this game is about more than just stats.

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