Rays vs Mariners Prediction, Odds, Moneyline, Spread & Over/Under for July 12

Odds updated as of 1:11 p.m.

The Tampa Bay Rays versus the Seattle Mariners is on the MLB schedule for Sunday.

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

Rays vs Mariners Game Info

• Tampa Bay Rays (56-37) vs. Seattle Mariners (47-49)
• Date: Sunday, July 12, 2026
• Time: 1:40 p.m. ET
• Venue: Tropicana Field -- St. Petersburg, Florida
• Coverage: Rays.TV and Mariners.TV

Rays vs Mariners Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: TB: (-142) | SEA: (+120)
• Spread: TB: -1.5 (+152) | SEA: +1.5 (-184)
• Total: 7.5 -- Over: (-124) | Under: (+102)

Rays vs Mariners Probable Starting Pitchers

Probable Pitchers: Ian Seymour (Rays) - 6-1, 4.11 ERA vs Emerson Hancock (Mariners) - 6-4, 3.23 ERA

This contest's pitching matchup is set, as the Rays will send Ian Seymour (6-1) to the mound, while Emerson Hancock (6-4) will get the nod for the Mariners. Seymour and his team have covered in each of the five games he's started with a spread this season. Seymour's team has won 75% of his starts when they are favored on the moneyline (3-1). The Mariners have a 6-11-0 record against the spread in Hancock's starts. The Mariners were named the moneyline underdog for two Hancock starts this season -- they split the games.

Rays vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Rays win (56.6%)

Rays vs Mariners Moneyline

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

Rays vs Mariners Spread

• The Rays are hosting the Mariners and are favored by 1.5 runs on the spread. The Rays are +152 to cover the runline, with the Mariners being -184.

Rays vs Mariners Over/Under

• A total of 7.5 runs has been set for the Rays-Mariners contest on July 12, with the over available at -124 and the under at +102.

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Rays vs Mariners Betting Trends

• The Rays have won in 39, or 65%, of the 60 contests they have been named as odds-on favorites in this year.
• This season Tampa Bay has come away with a win 11 times in 19 chances when named as a favorite of at least -142 on the moneyline.
• The Rays and their opponents have gone over the total this season in 43 of their 92 opportunities.
• The Rays are 56-36-0 against the spread in their 92 games with a line set by sportsbooks this season.
• The Mariners have won 16.7% of the games this season they were the underdog on the moneyline (2-10).
• Seattle has yet to play a game with moneyline odds of +120 or longer.
• The Mariners have played in 95 games with a set over/under, and have combined with their opponents to go over the total 45 times (45-46-4).
• The Mariners have a 34-61-0 record ATS this season (covering just 35.8% of the time).

Rays Player Leaders

• Junior Caminero has 99 hits, which ranks first among Tampa Bay hitters this season, while batting .281 with 42 extra-base hits. He has an on-base percentage of .373 and a slugging percentage of .560.
• Among all qualified batters in MLB, his batting average ranks 34th, his on-base percentage ranks 22nd, and he is seventh in slugging.
• Caminero hopes to build on a three-game hitting streak in this matchup. In his last five games he is hitting .222 with two doubles, two home runs, three walks and three RBIs.
• Yandy Diaz leads the Rays with an OPS of .887. He has a slash line of .320/.397/.490 this season.
• Among qualifying batters, his batting average ranks him third, his on-base percentage sixth, and his slugging percentage 28th.
• Jonathan Aranda is batting .297 with a .463 slugging percentage and 62 RBI this year.
• Aranda heads into this game with four games in a row with at least one hit. In his last five games he is batting .526 with four doubles, two walks and four RBIs.
• Chandler Simpson has been key for Tampa Bay with 92 hits, an OBP of .318 plus a slugging percentage of .344.
• Simpson brings a four-game hitting streak into this matchup. During his last five outings he is hitting .350 with two triples and an RBI.

Mariners Player Leaders

• Randy Arozarena has accumulated 92 hits with a .382 on-base percentage and a .453 slugging percentage, all club-bests for the Mariners. He's batting .288.
• He ranks 22nd in batting average, 15th in on-base percentage and 59th in slugging percentage among all qualified batters in the big leagues.
• Arozarena heads into this game on a three-game hitting streak. In his last five games he is hitting .313 with a home run, five walks and an RBI.
• Josh Naylor has 12 doubles, eight home runs and 29 walks while batting .251. He's slugging .354 with an on-base percentage of .313.
• He ranks 82nd in batting average, 108th in on-base percentage and 128th in slugging percentage in the majors.
• Cole Young is hitting .253 with 14 doubles, a triple, 11 home runs and 25 walks.
• Dominic Canzone has 13 doubles, a triple, 15 home runs and 22 walks while batting .264.

Rays vs Mariners Head to Head

• 7/11/2026: 6-1 TB (Favorite: Rays, Spread: -1.5, Total: 7, Favorite Moneyline: -110, Underdog Moneyline: -106)
• 7/10/2026: 7-2 TB (Favorite: Rays, Spread: -1.5, Total: 8.5, Favorite Moneyline: -120, Underdog Moneyline: +102)
• 9/3/2025: 9-4 TB (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 9/2/2025: 6-5 TB (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -118, Underdog Moneyline: -100)
• 9/1/2025: 10-2 TB (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -110, Underdog Moneyline: -106)
• 8/10/2025: 6-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -180, Underdog Moneyline: +152)
• 8/9/2025: 7-4 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -142, Underdog Moneyline: +120)
• 8/8/2025: 3-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 8/28/2024: 6-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -158, Underdog Moneyline: +134)
• 8/27/2024: 3-2 TB (Favorite: Mariners, Spread: -1.5, Total: 6.5, Favorite Moneyline: -162, Underdog Moneyline: +136)

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