Tampa Bay Rays vs Seattle Mariners Prediction, Preview and Odds - 08/09/2025

Game Time: 9:40 pm ET, Saturday, August 9, 2025

Venue:  T-Mobile Park, Seattle, WA 

Where to Watch:  MLBN

DraftKings:  Moneyline odds:  Rays +105, Mariners -128; Over/Under:  8 runs

Bet365:  Moneyline odds:  Rays +105, Mariners -125; Over/Under:  8 runs

BetMGM:  Moneyline odds:  Rays +105, Mariners -125; Over/Under:  8 runs

Tampa Bay Rays:  57-59 (4th place, AL East)

Seattle Mariners:  63-53 (2nd place, AL West)

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Tampa Bay Rays:  4-6 last 10

Seattle Mariners:  7-3 last 10

The Rays are entering this series off a win and won their 3-game series against the Los Angeles Angels 2-1 in their last series. They enter this game with a 57-59 record overall and have a road record of 25-29. This is the 2nd game of a 3-game series with the Mariners on Saturday with the series opener still to be played on Tuesday. Their offense ranks 15th in the MLB with a .714 OPS. Drew Rasmussen is their starting pitcher on Friday while Joe Boyle is making his start in this game on Saturday. He is 1-1 with a 2.30 ERA this season. His team lost their last 3 straight games this season with him making an appearance. In his last MLB regular season start, he allowed 0 ER, 0 HR, and 2 BB with 2 SO on 3 hits through 5 IP against the Los Angeles Dodgers.

The Mariners are entering this series off a win and completed the sweep in their 3-game series against the Chicago White Sox 3-0 in their last series. They enter this game with a 63-53 record overall and have a home record of 34-25. This is the 2nd game of a 3-game series with the Rays on Saturday with the 1st game of this series still to be played on Friday. Their offense ranks 10th in the MLB with a .729 OPS. Luis Castillo is their starting pitcher on Friday while rookie pitcher Logan Evans is making his start in this game on Saturday. He is 5-4 with a 4.30 ERA this season. His team won 3 of their last 4 games this season with him making an appearance. In his last MLB regular season start, he allowed 3 earned runs, 1 homer, and 0 walks with 3 strikeouts on 5 hits through 5 innings pitched against the Texas Rangers.

The current betting odds have the Mariners listed as a slight favorite in this game according to Draftkings Sportsbook. The Rays haven't looked good in their games this season with their 57-59 record overall which has them right near the bottom of the AL East. They haven't been a great road team either with their 25-29 road record this year. Meanwhile, the Mariners have looked really good in their games this season with their 63-53 record overall which has them right near the top of the NL West. They have looked good in their own ballpark too with their 34-25 home record this season. The Mariners have been rolling lately as they just swept the White Sox in their last series and have been red hot, going 7-3 in their last 10 games now while the Rays are only 4-6. The Rays do have the better pitching matchup here, but they haven't had a ton of success with this starter lately. Boyle is starting for the Rays in this one and he is 1-1 with a 2.30 ERA. He has looked good this season and is coming off another good start in which he gave up no runs, but his team has still lost 3 games in a row with him starting. Evans is on the mound for the Mariners in this one and he hasn't looked great in his rookie season. He is 5-4 with a 4.30 ERA and gave up 3 earned runs in his last start too, but his team has won 3 of their last 4 games with him starting and the Mariners also have a great offense to help out here. The Rays also traded away some players at the deadline and aren't trending in the best direction since then while the Mariners picked up some players and are looking to make a playoff push. The best way to place a bet here is on the Mariners to win this game. 

Rays Mariners Prediction:  Our MLB Pick for Saturday, August 9, 2025 (9:40 pm ET start time) is Mariners 5 Rays 2.

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Tampa Bay Rays: 44-45 (-10.6 units) on the moneyline against AL West opponents. 72-94 (-5.1 units) on the moneyline as an underdog of +100 or higher. 178-158 (-5 units) on the moneyline against right-handed starters. 31-23 OVER on the road vs. good power teams - averaging 1.25 or more HR's/game.

Seattle Mariners: 67-49 (+4.5 units) on the moneyline at home with a money line of -100 to -150. 156-114 (+17.1 units) on the moneyline vs. an AL team with an on base percentage .330 or worse. 112-77 (+11.2 units) on the moneyline vs. an AL team with a slugging percentage .410 or worse on the season. 33-19 OVER when the money line is -100 to -150.

Tampa Bay Rays:  J. DeLuca (CF) Day To Day - Hamstring. J. Aranda (1B) Ten Day IL - Wrist. S. Fairchild (RF) Ten Day IL - Oblique. H. Bigge (RP) Sixty Day IL - Lat. R. Palacios (LF) Sixty Day IL - Knee. M. Rodriguez (RP) Sixty Day IL - Forearm. S. McClanahan (SP) Sixty Day IL - Triceps. A. Faedo (RP) Sixty Day IL - Shoulder. N. Lavender (RP) Sixty Day IL - Elbow.

Seattle Mariners:  J. Naylor (1B) Day To Day - Shoulder. T. Thornton (RP) Fifteen Day IL - Achilles. L. Raley (RF) Ten Day IL - Back. B. Miller (SP) Fifteen Day IL - Elbow. G. Santos (RP) Sixty Day IL - Knee. V. Robles (RF) Sixty Day IL - Shoulder. R. Bliss (2B) Sixty Day IL - Biceps.

“I’m impressed with everything Junior does. To be at his age, the quality of the at-bat that you get, the power that he shows, the defensive play. He’s doing a lot of things to help us win. Continue to be impressed with the work that he puts in, and the really good results that he gets.” - Kevin Cash after his team’s win against the LA Angels in their game on Wednesday.

“He's not trying to hit the ball out of the ballpark. That's not what we needed. He was able to get kind of the perfect hit.” - Dan Wilson after his team’s win against the White Sox in their game on Thursday.

Chandler Simpson (L) LF

Yandy Díaz (R) 1B

Junior Caminero (R) 3B

Brandon Lowe (L) 2B

Ha-Seong Kim (R) SS

Jonny DeLuca (R) CF

Josh Lowe (L) RF

Christopher Morel (R) DH

Nick Fortes (R) C

Randy Arozarena (R) LF

Cal Raleigh (S) DH

Julio Rodríguez (R) CF

Josh Naylor (L) 1B

Eugenio Suárez (R) 3B

Jorge Polanco (S) 2B

Mitch Garver (R) C

Dominic Canzone (L) RF

J.P. Crawford (L) SS

Batting Average:  Richie Palacios (.750)

Hits:  Yandy Díaz (122)

Home Runs:  Junior Caminero (30)

RBI:  Junior Caminero (76)

Stolen Bases:  José Caballero (34)

Wins:  Drew Rasmussen (9)

Saves:  Pete Fairbanks (19)

ERA:  Ian Seymour (1.20)

Batting Average:  Dominic Canzone (.287)

Hits:  Julio Rodríguez (121)

Home Runs:  Cal Raleigh (42)

RBI:  Cal Raleigh (90)

Stolen Bases:  Julio Rodríguez (22)

Wins:  Bryan Woo (9)

Saves:  Andrés Muñoz (26)

ERA:  Sauryn Lao (0.00)

Managers:

Tampa Bay Rays: Kevin Cash (11th season)

Seattle Mariners: Dan Wilson (2nd season)