Phillies vs Mariners Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 20

Odds updated as of 9:12 p.m.

The Philadelphia Phillies are among the MLB teams playing on Wednesday, versus the Seattle Mariners.

All the information 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 (72-53) vs. Seattle Mariners (68-58)
• Date: Wednesday, August 20, 2025
• Time: 1:05 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: (-142) | SEA: (+120)
• Spread: PHI: -1.5 (+146) | SEA: +1.5 (-178)
• Total: 8.5 -- Over: (-108) | Under: (-112)

Phillies vs Mariners Probable Starting Pitchers

Probable Pitchers: Jesús Luzardo (Phillies) - 11-6, 4.21 ERA vs Luis Castillo (Mariners) - 8-6, 3.48 ERA

The Phillies will give the nod to Jesus Luzardo (11-6) against the Mariners and Luis Castillo (8-6). Luzardo's team is 11-13-0 against the spread in his starts this season. Luzardo's team is 12-8 this season when he starts and they are the moneyline favorite. The Mariners have an 11-14-0 record against the spread in Castillo's starts. The Mariners are 3-2 in Castillo's five starts this season that they were the underdog on the moneyline.

Phillies vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Phillies win (51.8%)

Phillies vs Mariners Moneyline

• Philadelphia is the favorite, -142 on the moneyline, while Seattle is a +120 underdog on the road.

Phillies vs Mariners Spread

• The Mariners are +1.5 on the spread (-178 to cover), and Philadelphia is +146 to cover the runline.

Phillies vs Mariners Over/Under

• The over/under for Phillies-Mariners on Aug. 20 is 8.5. The over is -108, and the under is -112.

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Phillies vs Mariners Betting Trends

• The Phillies have yet to play a game this season where they are listed as the favorite.
• This year Philadelphia has won 44 of 66 games when listed as at least -142 on the moneyline.
• This will be the first contest this season the Phillies will play in a game with a total set by sportsbooks
• The Phillies have yet play a game with a spread this season.
• The Mariners are playing as the moneyline underdog for the first time this season.
• In games it has played as a moneyline underdog with odds of +120 or longer, Seattle has a 7-6 record (winning 53.8% of its games).
• Oddsmakers have yet to set an over/under for any of the Mariners' games so far this season.
• The Mariners have not had a spread set for a contest this season.

Phillies Player Leaders

• Kyle Schwarber leads Philadelphia in OBP (.372) and total hits (116) this season. He's batting .249 batting average while slugging .572.
• Among qualified batters in the majors, his batting average ranks 102nd, his on-base percentage ranks 13th, and he is fourth in slugging.
• Schwarber hopes to build on a two-game hitting streak in this matchup. In his last five games he is hitting .250 with a double, a home run, four walks and six RBIs.
• Trea Turner has an OPS of .794, fueled by an OBP of .351 and a team-best slugging percentage of .442 this season. He's batting .295.
• He ranks 12th in batting average, 43rd in on-base percentage and 73rd in slugging in the majors.
• Turner enters this matchup looking to extend his eight-game hit streak. During his last 10 games he is batting .395 with three doubles, a home run, three walks and six RBIs.
• Bryce Harper has 97 hits this season and has a slash line of .262/.357/.508.
• Harper brings a two-game hitting streak into this matchup. In his last five games he is batting .348 with a double, three home runs, a walk and eight RBIs.
• Nick Castellanos has been key for Philadelphia with 119 hits, an OBP of .294 plus a slugging percentage of .414.
• Castellanos has safely hit in two games in a row. During his last five outings he is batting .190 with a double, a home run, a walk and an RBI.

Mariners Player Leaders

• Cal Raleigh has put up 115 hits, a team-best for the Mariners. He's batting .249 and slugging .593 with an on-base percentage of .355.
• Including all the qualifying players in the majors, his batting average puts him 102nd, his on-base percentage ranks 35th, and he is third in slugging.
• Josh Naylor is hitting .286 with 23 doubles, a triple, 15 home runs and 42 walks. He's slugging .450 with an on-base percentage of .351.
• His batting average ranks 24th among all qualified players, his on-base percentage ranks 43rd, and he is 64th in slugging.
• Julio Rodriguez has accumulated a team-best .459 slugging percentage.
• Eugenio Suarez is hitting .233 with 21 doubles, 38 home runs and 32 walks.

Phillies vs Mariners Head to Head

• 8/18/2025: 12-7 PHI (Favorite: Phillies, Spread: -1.5, Total: 7.5, Favorite Moneyline: -112, Underdog Moneyline: -104)
• 8/4/2024: 6-0 PHI (Favorite: Phillies, Spread: -1.5, Total: 7, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 8/3/2024: 6-5 SEA (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -118, Underdog Moneyline: -100)
• 8/2/2024: 10-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -116, Underdog Moneyline: -102)
• 4/27/2023: 1-0 PHI (Favorite: Phillies, Spread: -1.5, Total: 8, Favorite Moneyline: -108, Underdog Moneyline: -108)
• 4/26/2023: 6-5 PHI (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -116, Underdog Moneyline: -102)
• 4/25/2023: 5-3 SEA (Favorite: Phillies, Spread: -1.5, Total: 9, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 5/11/2022: 4-2 PHI (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -148, Underdog Moneyline: +126)
• 5/10/2022: 5-4 SEA (Favorite: Phillies, Spread: -1.5, Total: 7, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 5/9/2022: 9-0 PHI (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -122, Underdog Moneyline: +104)

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