Mariners vs Cardinals Prediction, Odds, Moneyline, Spread & Over/Under for Sept. 9

Odds updated as of 9:12 p.m.

MLB action on Tuesday includes the Seattle Mariners playing the St. Louis Cardinals.

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

Mariners vs Cardinals Game Info

• Seattle Mariners (76-68) vs. St. Louis Cardinals (72-73)
• Date: Tuesday, September 9, 2025
• Time: 9:40 p.m. ET
• Venue: T-Mobile Park -- Seattle, Washington
• Coverage: ROOT Sports NW and FDSMW

Mariners vs Cardinals Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-200) | STL: (+168)
• Spread: SEA: -1.5 (+105) | STL: +1.5 (-126)
• Total: 7.5 -- Over: (-115) | Under: (-105)

Mariners vs Cardinals Probable Starting Pitchers

Probable Pitchers: George Kirby (Mariners) - 8-7, 4.47 ERA vs Matthew Liberatore (Cardinals) - 7-11, 4.15 ERA

The Mariners will give the nod to George Kirby (8-7) against the Cardinals and Matthew Liberatore (7-11). Kirby and his team are 6-11-0 ATS this season when he starts. Kirby's team has a record of 8-7 this season when he starts and they are the favorite on the moneyline. The Cardinals have gone 13-11-0 ATS in Liberatore's 24 starts with a set spread. The Cardinals have been the moneyline underdog in 10 of Liberatore's starts this season, and they went 8-2 in those matchups.

Mariners vs Cardinals Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (65.4%)

Mariners vs Cardinals Moneyline

• St. Louis is the underdog, +168 on the moneyline, while Seattle is a -200 favorite at home.

Mariners vs Cardinals Spread

• The Mariners are 1.5-run home favorites on the runline against the Cardinals. The Mariners are +105 to cover, and the Cardinals are -126.

Mariners vs Cardinals Over/Under

• A total of 7.5 runs has been set for the Mariners-Cardinals game on Sept. 9, with the over available at -115 and the under at -105.

Bet on Seattle Mariners vs. St. Louis Cardinals on FanDuel today!

Mariners vs Cardinals Betting Trends

• The Mariners have been favorites in 97 games this season and have come away with the win 54 times (55.7%) in those contests.
• This season Seattle has been victorious seven times in nine chances when named as a favorite of at least -200 on the moneyline.
• The Mariners and their opponents have gone over the total this season in 74 of their 139 opportunities.
• The Mariners have an against the spread mark of 59-80-0 in 139 games with a line this season.
• The Cardinals have won 49.3% of the games this season they were the underdog on the moneyline (37-38).
• In games it has played as a moneyline underdog with odds of +168 or longer, St. Louis has a 1-4 record (winning just 20% of its games).
• In the 139 games bookmakers have set an over/under for the Cardinals, they have combined with opponents to go over the total 71 times (71-63-5).
• The Cardinals have a 70-69-0 record against the spread this season (covering 50.4% of the time).

Mariners Player Leaders

• Cal Raleigh has 128 hits, which leads Seattle hitters this season, while batting .242 with 72 extra-base hits. He has an on-base percentage of .350 and a slugging percentage of .577.
• Among all qualifying hitters in the majors, he is 110th in batting average, 38th in on-base percentage, and third in slugging.
• Julio Rodriguez has an OPS of .798, fueled by an OBP of .319 and a team-best slugging percentage of .479 this season. He's batting .268.
• He ranks 46th in batting average, 95th in on-base percentage and 32nd in slugging among qualifying batters.
• Rodriguez heads into this game looking to extend his three-game hit streak. In his last five games he is batting .381 with two doubles, three home runs and 11 RBIs.
• Josh Naylor is batting .282 with a .449 slugging percentage and 79 RBI this year.
• Naylor brings a three-game hitting streak into this game. During his last five outings he is batting .267 with a double, two home runs, a walk and six RBIs.
• Eugenio Suarez has 45 home runs, 109 RBI and a batting average of .236 this season.

Cardinals Player Leaders

• Alec Burleson has a team-high slugging percentage (.456) and leads the Cardinals in hits (124). He's batting .286 and with an on-base percentage of .336.
• Including all qualified hitters in the big leagues, he ranks 18th in batting average, 60th in on-base percentage and 55th in slugging percentage.
• Willson Contreras has 30 doubles, a triple, 20 home runs and 42 walks while hitting .254. He's slugging .448 with an on-base percentage of .338.
• He ranks 85th in batting average, 55th in on-base percentage and 59th in slugging percentage in the majors.
• Masyn Winn has racked up a slugging percentage of .363, a team-best for the Cardinals.
• Lars Nootbaar is hitting .241 with 22 doubles, a triple, 13 home runs and 55 walks.

Mariners vs Cardinals Head to Head

• 9/8/2025: 4-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -250, Underdog Moneyline: +205)
• 9/8/2024: 10-4 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -132, Underdog Moneyline: +112)
• 9/7/2024: 2-0 STL (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 9/6/2024: 6-1 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -112, Underdog Moneyline: -104)
• 4/23/2023: 7-3 STL (Favorite: Cardinals, Spread: -1.5, Total: 9, Favorite Moneyline: -110, Underdog Moneyline: -106)
• 4/22/2023: 5-4 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -164, Underdog Moneyline: +138)
• 4/21/2023: 5-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -130, Underdog Moneyline: +110)

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