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

Game Time: 9:40 pm ET, Friday, August 8, 2025

Venue:  T-Mobile Park, Seattle, WA 

Where to Watch:  FDSSUN, ROOT Sports NW

DraftKings:  Moneyline odds:  Rays +112, Mariners -137; Over/Under:  7 runs

Bet365:  Moneyline odds:  Rays +115, Mariners -135; Over/Under:  7 runs

BetMGM:  Moneyline odds:  Rays +115, Mariners -135; Over/Under:  7 runs

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

Seattle Mariners:  62-53 (2nd place, AL West)

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Tampa Bay Rays:  4-6 last 10

Seattle Mariners:  6-4 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 series opener of a 3-game series with the Mariners on Friday and they have Thursday off as a day of rest. Their offense ranks 14th in the MLB with a .714 OPS. Shane Baz was their starting pitcher on Wednesday while Drew Rasmussen is making his start in this game on Friday. He is 9-5 with a 2.81 ERA this season. His team won 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 0 BB with 6 SO on 4 hits through 5.1 IP against the Los Angeles Dodgers.

The Mariners won their 4-game series against the Texas Rangers 3-1. They enter this game with a 62-53 record overall and have a home record of 33-25. This is the 1st game of a 3-game series with the Rays on Friday with the series finale of their series against the Chicago White Sox still to be played on Thursday. The Mariners won the 1st game of that series on Tuesday and the 2nd game on Wednesday. Their offense ranks 10th in the MLB with a .732 OPS. Logan Gilbert is their starting pitcher on Thursday while Luis Castillo is making his start in this game on Friday. He is 8-6 with a 3.22 ERA this season. His team lost 2 of their last 3 games this season with him making an appearance. In his last MLB regular season start, he allowed 2 earned runs, 1 homer, and 1 walk with 4 strikeouts on 4 hits through 4.1 innings pitched against the Texas Rangers.

The current betting odds have the Rays listed as a slight underdog 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 62-53 record overall which has them right near the top of the NL West. They have looked good in their own ballpark too with their 33-25 home record this season. The Mariners have been the hotter team lately coming into this series, but the Rays do have the better pitching matchup here and can take advantage of that with their ace on the mound. Rasmussen is starting for the Rays in this one and he is 9-5 with a 2.81 ERA. He is coming off another great start in which he gave up no runs and his team has been having success with him lately too, winning 3 games in a row now with him starting. The Mariners are going with Castillo in this one and he has been a solid starter this year. He is 8-6 with a 3.22 ERA and hasn't been giving up many runs lately, but the team has struggled more with him. They have lost 2 of their last 3 games with him starting and he gave up 2 earned runs in his last start which isn't bad, but he didn't make it a full 5 innings in that start either. Rasmussen is going to deliver a better outing of the 2 starters and the Rays can take advantage of that. The best way to place a bet here is on the Rays to win this game. 

Rays Mariners Prediction:  Our MLB Pick for Friday, August 8, 2025 (9:40 pm ET start time) is Rays 3 Mariners 1.

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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. 155-114 (+16.1 units) on the moneyline vs. an AL team with an on base percentage .330 or worse. 85-69 (+10.2 units) on the moneyline vs. an AL starting pitcher whose WHIP is 1.300 or better. 50-31 OVER vs. an AL starting pitcher whose ERA is 3.70 or better.

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:  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 looks at the game in a different light and takes advantage of the things he sees.” - Dan Wilson after his team’s win against the White Sox in their game on Wednesday.

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 (.290)

Hits:  Julio Rodríguez (120)

Home Runs:  Cal Raleigh (42)

RBI:  Cal Raleigh (90)

Stolen Bases:  Randy Arozarena (21)

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)