Mariners vs Orioles Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 12

Odds updated as of 2:11 a.m.

Tuesday's slate in the MLB includes a matchup between the Seattle Mariners and the Baltimore Orioles.

We've got you covered, in terms of the vital information about this matchup before you take a look at the MLB odds and spreads on FanDuel Sportsbook.

Mariners vs Orioles Game Info

• Seattle Mariners (66-53) vs. Baltimore Orioles (53-65)
• Date: Tuesday, August 12, 2025
• Time: 6:35 p.m. ET
• Venue: Oriole Park at Camden Yards -- Baltimore, Maryland
• Coverage: MASN and ROOT Sports NW

Mariners vs Orioles Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-162) | BAL: (+136)
• Spread: SEA: -1.5 (+104) | BAL: +1.5 (-125)
• Total: 9 -- Over: (-122) | Under: (-100)

Mariners vs Orioles Probable Starting Pitchers

Probable Pitchers: George Kirby (Mariners) - 7-5, 4.04 ERA vs Dean Kremer (Orioles) - 8-8, 4.35 ERA

The Mariners will call on George Kirby (7-5) against the Orioles and Dean Kremer (8-8). Kirby's team is 6-7-0 against the spread this season in his starts. Kirby's team is 7-4 this season when he starts and they are the moneyline favorite. When Kremer starts, the Orioles have gone 10-12-0 against the spread. The Orioles are 4-7 in Kremer's 11 starts this season that they were the underdog on the moneyline.

Mariners vs Orioles Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (57.7%)

Mariners vs Orioles Moneyline

• Seattle is a -162 favorite on the moneyline, while Baltimore is a +136 underdog at home.

Mariners vs Orioles Spread

• The Orioles are +1.5 on the spread (-125 to cover), and Seattle is +104 to cover the runline.

Mariners vs Orioles Over/Under

• The over/under for Mariners-Orioles on Aug. 12 is 9. The over is -122, and the under is -100.

Bet on Seattle Mariners vs. Baltimore Orioles on FanDuel today!

Mariners vs Orioles Betting Trends

• The Mariners have been favorites in 80 games this season and have come away with the win 46 times (57.5%) in those contests.
• This season Seattle has been victorious 17 times in 25 chances when named as a favorite of at least -162 on the moneyline.
• The Mariners' games have gone over the total in 61 of their 116 opportunities.
• In 116 games with a line this season, the Mariners have a mark of 51-65-0 against the spread.
• The Orioles have been the moneyline underdog 60 total times this season. They've gone 27-33 in those games.
• Baltimore has a record of 4-9 in games it has played as a moneyline underdog with odds of +136 or longer (30.8%).
• In the 116 games oddsmakers have set an over/under for the Orioles, they have combined with opponents to go over the total 50 times (50-62-4).
• The Orioles have a 51-65-0 record ATS this season (covering 44% of the time).

Mariners Player Leaders

• Cal Raleigh leads Seattle in total hits (108) this season while batting .247 with 61 extra-base hits. He has an on-base percentage of .354 and a slugging percentage of .593.
• Among all qualifying batters, he ranks 106th in batting average, his on-base percentage ranks 37th, and he is third in slugging.
• Raleigh will look for his fourth straight game with a hit in this contest. In his last five games he is batting .200 with three home runs, three walks and 10 RBIs.
• Josh Naylor leads Seattle in OBP (.360) this season, fueled by 117 hits. He's batting .292 while slugging .464.
• Among qualifying hitters, his batting average places him 13th, his on-base percentage 28th, and his slugging percentage 48th.
• Naylor takes a two-game streak with at least one hit into this contest. In his last five games he is batting .500 with two doubles, three home runs, two walks and five RBIs.
• Julio Rodriguez has an OPS of .759, fueled by an OBP of .311 and a team-best slugging percentage of .448 this season.
• Rodriguez enters this game with two games in a row with at least one hit. In his last five games he is batting .300 with three home runs, a walk and six RBIs.
• Eugenio Suarez is batting .235 with a .305 OBP and 92 RBI for Seattle this season.

Orioles Player Leaders

• Gunnar Henderson has an on-base percentage of .353, a slugging percentage of .464, and has 118 hits, all club-bests for the Orioles (while batting .284).
• He ranks 25th in batting average, 39th in on-base percentage and 48th in slugging percentage among all qualifying hitters in the majors.
• Henderson hopes to build on a four-game hitting streak in this matchup. During his last five outings he is hitting .235 with a home run, a walk and three RBIs.
• Jackson Holliday is batting .251 with 15 doubles, two triples, 14 home runs and 28 walks. He's slugging .391 with an on-base percentage of .303.
• Including all qualified players, he is 95th in batting average, 127th in on-base percentage and 123rd in slugging percentage.
• Adley Rutschman is batting .235 with 16 doubles, a triple, nine home runs and 37 walks.
• Jordan Westburg has nine doubles, a triple, 14 home runs and 12 walks while batting .266.

Mariners vs Orioles Head to Head

• 6/5/2025: 4-3 BAL (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -156, Underdog Moneyline: +132)
• 6/4/2025: 3-2 BAL (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -108, Underdog Moneyline: -108)
• 6/3/2025: 5-1 BAL (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -148, Underdog Moneyline: +126)
• 7/4/2024: 7-3 SEA (Favorite: Orioles, Spread: -1.5, Total: 7, Favorite Moneyline: -144, Underdog Moneyline: +122)
• 7/3/2024: 4-1 BAL (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -136, Underdog Moneyline: +116)
• 7/2/2024: 2-0 BAL (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -108, Underdog Moneyline: -108)
• 5/19/2024: 6-3 BAL (Favorite: Orioles, Spread: -1.5, Total: 7, Favorite Moneyline: -144, Underdog Moneyline: +122)
• 5/17/2024: 9-2 BAL (Favorite: Orioles, Spread: -1.5, Total: 8.5, Favorite Moneyline: -132, Underdog Moneyline: +112)
• 8/13/2023: 5-3 BAL (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -112, Underdog Moneyline: -104)
• 8/12/2023: 1-0 BAL (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -164, Underdog Moneyline: +138)

Sign up for FanDuel Sportsbook and FanDuel Daily Fantasy today!