Mariners vs Guardians Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 31

Odds updated as of 1:11 p.m.

On Sunday in MLB, the Seattle Mariners are playing the Cleveland Guardians.

All the information you need to make smart wagers on this game at FanDuel Sportsbook can be found below. Check out all of the latest MLB betting lines here.

Mariners vs Guardians Game Info

• Seattle Mariners (72-64) vs. Cleveland Guardians (68-66)
• Date: Sunday, August 31, 2025
• Time: 1:40 p.m. ET
• Venue: Progressive Field -- Cleveland, Ohio
• Coverage: CLEG and ROOT Sports NW

Mariners vs Guardians Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-116) | CLE: (-102)
• Spread: SEA: -1.5 (+142) | CLE: +1.5 (-172)
• Total: 8 -- Over: (-118) | Under: (-104)

Mariners vs Guardians Probable Starting Pitchers

Probable Pitchers: Bryce Miller (Mariners) - 3-5, 5.98 ERA vs Tanner Bibee (Guardians) - 9-10, 4.73 ERA

The Mariners will give the nod to Bryce Miller (3-5, 5.98 ERA), who is eyeing win No. 4 on the season, and the Guardians will counter with Tanner Bibee (9-10, 4.73 ERA). Miller's team is 5-7-0 against the spread in his starts this season. When Miller starts a game and his team is the favorite on the moneyline, they have a record of 3-4. The Guardians have a 15-10-0 record against the spread in Bibee's starts. The Guardians have a 4-7 record in Bibee's 11 starts this season when they were the moneyline underdog.

Mariners vs Guardians Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (53.6%)

Mariners vs Guardians Moneyline

• Seattle is the favorite, -116 on the moneyline, while Cleveland is a -102 underdog despite being at home.

Mariners vs Guardians Spread

• The Mariners are 1.5-run road favorites on the runline against the Guardians. The Mariners are +142 to cover, and the Guardians are -172.

Mariners vs Guardians Over/Under

• A total of 8 runs has been set for the Mariners-Guardians game on Aug. 31, with the over available at -118 and the under at -104.

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Mariners vs Guardians Betting Trends

• The Mariners have been victorious in 51, or 56%, of the 91 contests they have been chosen as favorites in this season.
• This season Seattle has come away with a win 49 times in 84 chances when named as a favorite of at least -116 on the moneyline.
• The Mariners and their opponents have gone over in 69 of their 131 games with a total set by sportsbooks this season.
• In 131 games with a line this season, the Mariners have a mark of 55-76-0 against the spread.
• The Guardians have been the underdog on the moneyline 74 total times this season. They've finished 32-42 in those games.
• Cleveland has a 27-35 record (winning 43.5% of its games) when it has played as a moneyline underdog of -102 or longer.
• The Guardians have played in 131 games with a set over/under, and have combined with their opponents to go over the total 59 times (59-67-5).
• The Guardians have a 69-62-0 record ATS this season (covering 52.7% of the time).

Mariners Player Leaders

• Cal Raleigh leads Seattle with 120 hits and an OBP of .352 this season. He has a .241 batting average and a slugging percentage of .581.
• Among qualified batters in MLB, his batting average ranks 118th, his on-base percentage ranks 35th, and he is third in slugging.
• Julio Rodriguez leads Seattle in slugging percentage (.462) thanks to 54 extra-base hits. He's batting .264 with an on-base percentage of .317.
• Among qualified hitters, he ranks 61st in batting average, 101st in on-base percentage and 52nd in slugging percentage.
• Rodriguez has picked up at least one hit in six straight games. During his last 10 outings he is batting .316 with a double, two home runs, two walks and seven RBIs.
• Josh Naylor has 131 hits this season and has a slash line of .284/.347/.444.
• Eugenio Suarez has 42 home runs, 105 RBI and a batting average of .235 this season.

Guardians Player Leaders

• Jose Ramirez has put up a team-best OBP (.360) and slugging percentage (.504), and paces the Guardians in hits (139, while batting .285).
• Including all qualified hitters, he ranks 19th in batting average, while his on-base percentage ranks 24th and he is 19th in slugging.
• Steven Kwan is batting .271 with 22 doubles, a triple, 10 home runs and 45 walks. He's slugging .376 with an on-base percentage of .329.
• Including all qualified hitters, he ranks 41st in batting average, 81st in on-base percentage and 132nd in slugging percentage.
• Kyle Manzardo has 14 doubles, two triples, 23 home runs and 41 walks while hitting .235.
• Angel Martinez has 21 doubles, a triple, 10 home runs and 16 walks while batting .226.

Mariners vs Guardians Head to Head

• 8/30/2025: 4-3 CLE (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -154, Underdog Moneyline: +130)
• 8/29/2025: 5-4 CLE (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -162, Underdog Moneyline: +136)
• 6/15/2025: 6-0 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -124, Underdog Moneyline: +106)
• 6/14/2025: 4-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -136, Underdog Moneyline: +116)
• 6/13/2025: 7-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -112, Underdog Moneyline: -104)
• 6/20/2024: 6-3 CLE (Favorite: Guardians, Spread: -1.5, Total: 8, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 6/19/2024: 8-0 CLE (Favorite: Guardians, Spread: -1.5, Total: 7.5, Favorite Moneyline: -156, Underdog Moneyline: +132)
• 6/18/2024: 8-5 SEA (Favorite: Guardians, Spread: -1.5, Total: 8.5, Favorite Moneyline: -134, Underdog Moneyline: +114)
• 4/3/2024: 8-0 CLE (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -154, Underdog Moneyline: +130)
• 4/2/2024: 5-2 CLE (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -120, Underdog Moneyline: +102)

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