Phillies vs Mariners Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 18

Odds updated as of 2:13 a.m.

The Monday slate in MLB includes a matchup between the Philadelphia Phillies and the Seattle Mariners.

Before checking out the MLB betting lines on FanDuel Sportsbook, we've got you covered, in terms of the vital information about this matchup.

Phillies vs Mariners Game Info

• Philadelphia Phillies (71-53) vs. Seattle Mariners (68-57)
• Date: Monday, August 18, 2025
• Time: 6:45 p.m. ET
• Venue: Citizens Bank Park -- Philadelphia, Pennsylvania
• Coverage: MLB Network, NBCS-PH, and ROOT Sports NW

Phillies vs Mariners Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: PHI: (-108) | SEA: (-108)
• Spread: PHI: +1.5 (-178) | SEA: -1.5 (+146)
• Total: 8 -- Over: (-110) | Under: (-110)

Phillies vs Mariners Probable Starting Pitchers

Probable Pitchers: Ranger Suarez (Phillies) - 8-6, 3.28 ERA vs Logan Gilbert (Mariners) - 3-4, 3.31 ERA

The Phillies will give the nod to Ranger Suarez (8-6, 3.28 ERA), who is eyeing win No. 9 on the season, and the Mariners will counter with Logan Gilbert (3-4, 3.31 ERA). Suarez and his team have a record of 9-7-0 against the spread when he starts. Suarez's team has been victorious in 57.1% of the games he's started as the moneyline favorite with a record of 8-6. When Gilbert starts, the Mariners have gone 5-11-0 against the spread. The Mariners were named the moneyline underdog for one Gilbert start this season -- they lost.

Phillies vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Phillies win (51.9%)

Phillies vs Mariners Moneyline

• The moneyline numbers for Phillies vs. Mariners reveal Philadelphia as the favorite (-108) and Seattle as the underdog (-108) on the road.

Phillies vs Mariners Spread

Phillies vs Mariners Over/Under

• A total of 8 runs has been set for the Phillies-Mariners contest on Aug. 18, with the over available at -110 and the under at -110.

Bet on Philadelphia Phillies vs. Seattle Mariners on FanDuel today!

Phillies vs Mariners Betting Trends

• The Phillies have been chosen as favorites in 95 games this year and have walked away with the win 60 times (63.2%) in those games.
• Philadelphia has a record of 61-36 in contests when oddsmakers favor them by -108 or more on the moneyline.
• The Phillies and their opponents have hit the over in 45 of their 117 games with a total set by oddsmakers this season.
• The Phillies have posted a record of 60-57-0 against the spread this season.
• The Mariners have gone 17-16 in games they were listed as the moneyline underdog (winning 51.5% of those games).
• Seattle has a 17-16 record (winning 51.5% of its games) when it has played as a moneyline underdog of -108 or longer.
• The Mariners have combined with opponents to go over the total 62 times this season for a 62-53-5 record against the over/under.
• The Mariners have collected a 52-68-0 record ATS this season (covering 43.3% of the time).

Phillies Player Leaders

• Kyle Schwarber leads Philadelphia in OBP (.371) and total hits (114) this season. He's batting .248 batting average while slugging .574.
• Among all qualified batters in baseball, he ranks 106th in batting average, 13th in on-base percentage, and fourth in slugging.
• Trea Turner has an OPS of .780, fueled by an OBP of .348 and a team-best slugging percentage of .432 this season. He's batting .291.
• He is 15th in batting average, 47th in on-base percentage and 78th in slugging among qualified hitters.
• Turner has picked up at least one hit in seven straight games. During his last 10 outings he is hitting .366 with three doubles, a home run, five walks and six RBIs.
• Bryce Harper has 94 hits this season and has a slash line of .258/.355/.492.
• Nick Castellanos is batting .253 with a .291 OBP and 61 RBI for Philadelphia this season.

Mariners Player Leaders

• Cal Raleigh has accumulated an on-base percentage of .359 and has 115 hits, both team-best numbers for the Mariners. He's batting .252 and slugging .600.
• Including all the qualified hitters in the majors, his batting average ranks 98th, his on-base percentage is 26th, and he is third in slugging.
• Raleigh brings a three-game hitting streak into this matchup. During his last five outings he is batting .438 with two doubles, two home runs, four walks and four RBIs.
• Josh Naylor is batting .286 with 22 doubles, a triple, 15 home runs and 42 walks. He's slugging .449 with an on-base percentage of .352.
• He is currently 22nd in batting average, 39th in on-base percentage and 65th in slugging percentage among all qualifying hitters.
• Julio Rodriguez has accumulated a team-high .457 slugging percentage.
• Eugenio Suarez has 21 doubles, 38 home runs and 32 walks while hitting .235.

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