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

Odds updated as of 12:11 p.m.

The Philadelphia Phillies versus the Seattle Mariners is on the MLB schedule for Wednesday.

Here's everything you need to know before checking out today's MLB odds and spreads on FanDuel Sportsbook.

Phillies vs Mariners Game Info

• Philadelphia Phillies (73-53) vs. Seattle Mariners (68-59)
• 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: (-144) | SEA: (+122)
• Spread: PHI: -1.5 (+142) | SEA: +1.5 (-172)
• Total: 8.5 -- Over: (-120) | Under: (-102)

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 call on Jesus Luzardo (11-6) versus the Mariners and Luis Castillo (8-6). Luzardo and his team are 11-13-0 ATS this season when he starts. Luzardo's team is 12-8 this season when he starts and they are the moneyline favorite. The Mariners have an 11-14-0 ATS record in Castillo's 25 starts with a set spread. The Mariners are 3-2 in Castillo's five starts this season that they were the moneyline underdog.

Phillies vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Phillies win (50.8%)

Phillies vs Mariners Moneyline

• The Phillies vs Mariners moneyline has Philadelphia as a -144 favorite, while Seattle is a +122 underdog on the road.

Phillies vs Mariners Spread

• The Mariners are at the Phillies, and are +1.5 on the runline. The Mariners are +142 to cover the spread, and the Phillies are -172.

Phillies vs Mariners Over/Under

• A total of 8.5 runs has been set for the Phillies-Mariners contest on Aug. 20, with the over available at -120 and the under at -102.

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Phillies vs Mariners Betting Trends

• The Phillies have won in 62, or 63.9%, of the 97 contests they have been named as odds-on favorites in this year.
• Philadelphia has a record of 43-20 in contests when oddsmakers favor them by -144 or more on the moneyline.
• The Phillies' games have gone over the total in 47 of their 119 opportunities.
• The Phillies have posted a record of 62-57-0 against the spread this season.
• The Mariners have put together a 17-18 record in games they were listed as the moneyline underdog (winning 48.6% of those games).
• When it has played as a moneyline underdog with odds of +122 or longer, Seattle has gone 4-7 (36.4%).
• The Mariners have had an over/under set by bookmakers 122 times, and have combined with opponents to go over the total in 64 of those games (64-53-5).
• The Mariners have a 52-70-0 record against the spread this season (covering 42.6% of the time).

Phillies Player Leaders

• Kyle Schwarber has 117 hits and an OBP of .371, both of which are best among Philadelphia hitters this season. He has a .249 batting average and a slugging percentage of .576.
• Among all qualifying hitters in baseball, he is 101st in batting average, 14th in on-base percentage, and fourth in slugging.
• Schwarber hopes to build on a three-game hitting streak in this matchup. During his last five outings he is batting .250 with two home runs, four walks and six RBIs.
• Trea Turner has hit 13 homers this season while driving in 57 runs. He's batting .295 this season and slugging .441 with an on-base percentage of .351.
• Among qualifiers, he is 13th in batting average, 40th in on-base percentage and 74th in slugging percentage.
• Turner takes a nine-game streak with at least one hit into this contest. In his last 10 outings he is batting .419 with three doubles, a home run, three walks and six RBIs.
• Bryce Harper has collected 98 base hits, an OBP of .356 and a slugging percentage of .507 this season.
• Harper has recorded a hit in three games in a row. In his last five games he is batting .364 with a double, three home runs, a walk and eight RBIs.
• Nick Castellanos has been key for Philadelphia with 119 hits, an OBP of .291 plus a slugging percentage of .411.

Mariners Player Leaders

• Cal Raleigh has a team-best OBP (.358), while leading the Mariners in hits (116). He's batting .249 and slugging.
• Including all the qualified hitters in MLB, his batting average ranks 101st, his on-base percentage is 30th, and he is third in slugging.
• Josh Naylor is batting .283 with 23 doubles, a triple, 15 home runs and 42 walks. He's slugging .445 with an on-base percentage of .348.
• He is currently 25th in batting average, 46th in on-base percentage and 70th in slugging percentage among all qualified batters.
• Julio Rodriguez has put up a team-high .456 slugging percentage.
• Eugenio Suarez has 23 doubles, 38 home runs and 32 walks while batting .237.

Phillies vs Mariners Head to Head

• 8/19/2025: 6-4 PHI (Favorite: Phillies, Spread: -1.5, Total: 8, Favorite Moneyline: -205, Underdog Moneyline: +172)
• 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)

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