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

Odds updated as of 6:17 p.m.

The MLB's Monday schedule includes the Philadelphia Phillies facing the Seattle Mariners.

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

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: (-112) | SEA: (-104)
• Spread: PHI: +1.5 (-194) | SEA: -1.5 (+160)
• Total: 7.5 -- Over: (-115) | Under: (-105)

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

This contest's pitching matchup is set, as the Phillies will send Ranger Suarez (8-6) to the mound, while Logan Gilbert (3-4) will get the nod for the Mariners. Suarez and his team have a record of 9-7-0 against the spread when he starts. Suarez's team has a record of 8-6 this season when he starts and they are the favorite on the moneyline. When Gilbert starts, the Mariners are 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 (52.7%)

Phillies vs Mariners Moneyline

• The moneyline numbers for Phillies vs. Mariners reveal Philadelphia as the favorite (-112) and Seattle as the underdog (-104) on the road.

Phillies vs Mariners Spread

• The Mariners are 1.5-run favorites against the spread for this matchup with the Phillies. The Mariners are +160 to cover, while the Phillies are -194 to cover as a 1.5-run underdog on the runline.

Phillies vs Mariners Over/Under

• Phillies versus Mariners on Aug. 18 has an over/under of 7.5 runs, with the odds on the over -115 and the under set at -105.

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Phillies vs Mariners Betting Trends

• The Phillies have been favorites in 95 games this season and have come away with the win 60 times (63.2%) in those contests.
• Philadelphia has a record of 59-35 in contests when oddsmakers favor them by -112 or more on the moneyline.
• The Phillies and their opponents have gone over the total this season in 45 of their 117 opportunities.
• The Phillies have posted a record of 60-57-0 against the spread this season.
• The Mariners have been the underdog on the moneyline 33 total times this season. They've finished 17-16 in those games.
• Seattle has a 17-14 record (winning 54.8% of its games) when playing as a moneyline underdog of -104 or longer.
• The Mariners have had an over/under set by bookmakers 120 times, and have combined with opponents to go over the total in 62 of those games (62-53-5).
• The Mariners have a 52-68-0 record against the spread this season.

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 qualified hitters in MLB, his batting average ranks 106th, his on-base percentage ranks 13th, and he is fourth in slugging.
• Trea Turner has hit 12 homers this season while driving in 52 runs. He's batting .291 this season and slugging .432 with an on-base percentage of .348.
• Among qualifying batters, he ranks 14th in batting average, 47th in on-base percentage and 78th in slugging percentage.
• Turner has picked up at least one hit in seven games in a row. In his last 10 outings he is hitting .366 with three doubles, a home run, five walks and six RBIs.
• Bryce Harper has collected 94 base hits, an OBP of .355 and a slugging percentage of .492 this season.
• Nick Castellanos is batting .253 with a .291 OBP and 61 RBI for Philadelphia this season.

Mariners Player Leaders

• Cal Raleigh has a team-high OBP (.359), while pacing the Mariners in hits (115). He's batting .252 and slugging.
• Including all qualifying hitters in the big leagues, he is 98th in batting average, 27th in on-base percentage and third in slugging percentage.
• Raleigh heads into this game on a three-game hitting streak. In his last five games he is hitting .438 with two doubles, two home runs, four walks and four RBIs.
• Josh Naylor has 22 doubles, a triple, 15 home runs and 42 walks while batting .286. He's slugging .449 with an on-base percentage of .352.
• Including all qualifying hitters, he ranks 22nd in batting average, 39th in on-base percentage and 64th in slugging percentage.
• Julio Rodriguez has put up a slugging percentage of .457, a team-best for the Mariners.
• Eugenio Suarez is hitting .235 with 21 doubles, 38 home runs and 32 walks.

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