Seattle Mariners vs Philadelphia Phillies Preview, 8/18/2025 MLB Predictions, Top Picks & Odds

Matchup: Seattle Mariners vs Philadelphia Phillies

Date: Monday, August 18, 2025

Venue: Citizens Bank Park, Philadelphia, PA

Broadcast: NBC Sports Philadelphia

Betting Odds: Seattle (+150) | Philadelphia (-182)

The Seattle Mariners (67-55) are headed to Citizens Bank Park on Monday to face off against the Philadelphia Phillies (69-52). Currently, the moneyline for this matchup places the Mariners at +150 and the Phillies at -182, with a total over/under set at 8 runs. The starting pitchers for this encounter will be Logan Gilbert for Seattle and Ranger Suarez for Philadelphia.

The Mariners bring a slugging percentage of .408 into this game, having struck out 1,080 times and drawn 413 walks this season. With a total of 531 RBIs and 1,007 hits, their team batting average stands at .243. Seattle has hit 157 doubles and smashed 172 home runs, resulting in 554 runs scored, giving them an on-base percentage of .319. They average 4.5 runs per game, ranking them 11th in the league.

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The Mariners boast a strikeout-to-walk ratio of 2.83 and a collective WHIP of 1.23 among their pitchers. They have given up 141 home runs and allowed 519 total runs (15th in the league). Seattle’s staff has yielded a total of 989 hits, averaging 8.0 hits per 9 innings, and 465 earned runs, resulting in a team ERA of 3.78 (10th in MLB). Their pitchers have struck out 1,040 batters and walked 368, with a FIP of 4.04.

Seattle’s bullpen has achieved a save rate of 61.5% from 120 save chances. They have inherited 111 runners this year, with 26.1% of them scoring. Mariners’ pitchers have entered games with players on base 103 times and have had 173 high-leverage appearances. So far this season, 409 relief pitchers have taken to the mound, achieving 68 holds (15th in MLB) while converting 32 saves from 52 opportunities.

Defensively, the Mariners have converted 71.0% of balls in play into outs across 9,957 innings, ranking them 7th in the league. The San Francisco Giants have accumulated 3,319 putouts, alongside 1,027 assists and 50 errors, resulting in a fielding percentage of .989 (4th in MLB), with a total of 91 double plays recorded.

Logan Gilbert has logged 793 innings in his professional career, tallying 835 strikeouts. His career ERA stands at 3.57 with 315 earned runs allowed, and a WHIP of 1.055. Gilbert has given up 664 hits (7.5 hits per nine innings) and has issued 173 walks, holding a career FIP of 3.52 against 3,203 batters.

The Phillies, on the other hand, have a team slugging percentage of .414 and score 4.61 runs per game (9th in league standings). They have recorded 200 doubles and earned 558 runs, along with 143 home runs and 535 RBIs. Philadelphia has seen 979 strikeouts (19th in MLB) and posted 1,039 hits, standing at a .253 batting average and .323 on-base percentage this season.

The Phillies’ pitching staff boasts a team WHIP of 1.234 and a FIP of 3.68. They rank 20th in the league for total hits allowed, giving up 1,000 hits and 479 runs during the season, leading to a team ERA of 3.73 (446 earned runs). The pitcher’s strikeout-to-walk ratio is an impressive 9.20, with 1,099 strikeouts countered with 327 walks, while allowing 132 home runs and 4.01 runs per 9 innings (5th in baseball).

This season, Phillies relievers have been called upon for 50 save opportunities, converting 32 saves. They hold the 13th position in MLB with a save percentage of 64.0% and have utilized 368 relief pitchers so far. Their bullpen has appeared 121 times in high-leverage situations and has faced base runners on 76 occasions, with an inherited scoring percentage of 33.0% from 112 inherited runners. The Phillies have recorded 56 holds and have blown 18 of 107 save situations.

In their 9,678 innings played, the Phillies show a defensive efficiency of 69.2% (22nd in MLB). They have turned 77 double plays and maintain a fielding percentage of .990 (3rd in MLB), alongside 1,047 assists, 45 errors, and 3,226 putouts this season.

Ranger Suarez, throughout his professional career, has allowed 680 hits and amassed 655 strikeouts over 716 innings pitched. With a 49-35 win-loss record, he holds a 3.40 earned run average and allows 8.5 hits per nine innings. Suarez has given up 271 earned runs, with a WHIP of 1.272 and a FIP of 3.4. His current strikeout-to-walk ratio stands at 2.84 against 3,011 batters faced in his career.

Which team will come out on top for this MLB showdown against the spread or moneyline?

Tony Sink’s Prediction: Take Seattle (+150)

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