Rays vs. Mariners Prediction, MLB Picks for Saturday, August 8

First pitch for the Tampa Bay Rays vs. Seattle Mariners game is set for 9:50 p.m. ET on Saturday, August 8, with the Mariners entering as home favorites and returning a 1.78x payout if they win, via PrizePicks.

Today’s outing is game two of the second and final three-game series between these two teams this season. The Rays won the first set two 2-1 and got off to another good start in this series, winning on Friday. Can the Mariners defend home field and even this series up?

Below, we'll break down our Rays vs. Mariners prediction and picks for Saturday’s MLB game, including the spread, over/under, and key player picks for PrizePicks.

Make your picks for Rays vs. Mariners on PrizePicks now.

{{mlb_offer_banner="/style-system/ui-components-playbook"}}

Rays vs. Mariners Prediction, Winner Payout, Over/Under – Saturday, August 8

These Tampa Bay Rays are something else. With last night’s victory, they moved to 69-46 with a 4.5-game lead over the New York Yankees for the division lead and hold the best record in the American League. It's an impressive feat regardless of circumstance, but even more so when you consider they have a bottom-10 payroll.

Tonight, they'll send SP Griffin Jax (3.34 xFIP) to the mound to try to secure the series victory in Seattle. Jax has been fantastic this season and even better in the second half, where he's pitched to a 2.58 xFIP.

With last night’s loss, the Mariners are now 56-61 overall and four games behind the Houston Astros in the AL West. Perhaps they deserve a slightly better fate, as their -15 run differential is actually the best mark in the division. While it would take a miracle to match last year’s 90 wins, a strong close to the season could still see them win the division again.

They will try to even the series tonight with SP George Kirby (3.72 xFIP) leading the charge. It's been an average year for the Mariners righty, who owns the lowest strikeout rate of his five-year career but has generated enough ground balls and soft contact to keep the Mariners competitive in his starts.

Rays vs. Mariners Winner Payout, Over/Under – Saturday, August 8

The Mariners enter Saturday’s game as home favorites against the Rays, returning a 1.78x payout if they win outright, via PrizePicks Team Picks.

Here are the full payouts for the Rays vs. Mariners game on PrizePicks.

Play the Rays vs. Mariners spread or over/under on PrizePicks Team Picks to earn real money — available in 36 states!

Team Picks data is live at the time of writing and is subject to change.

Rays vs. Mariners Prediction on Winner – 8/8/26

Here are the key game stats and trends behind our Rays vs. Mariners prediction on the winner for Saturday, August 8.

Lock in your Rays vs. Mariners prediction on PrizePicks now.

Unless otherwise noted, data used in this article is from Baseball Savant or FanGraphs.

• The Rays are a dominant 66-49-0 (57.4%) against the spread this season, the third-best covering record in baseball.
• The Mariners have been the worst ATS club, owning a dismal record of 44-73-0 (37.6%).
• Over the last month, the Rays' offense owns the 11th-best wRC+ (105) in the majors. The Mariners are 18th in the same span with a wRC+ of 92.
• Kirby has struggled in the second half of the season, sporting a FIP of 5.27.
• The Mariners' biggest edge should lie in the bullpen, as they own the second-best SIERA (skill interactive ERA) over the last month at 3.04. With that said, the Rays' SIERA of 3.40 is seventh in the same timeframe.

Rays vs. Mariners Picks, Player Stats for PrizePicks: 8/8/26

Here are the top Rays vs. Mariners picks to target on Saturday, August 8. Today’s MLB picks for PrizePicks include Griffin Jax and George Kirby.

Rays P Griffin Jax vs. Mariners: 5.5 Strikeouts

• Jax has some of the most drastic home/road splits in baseball in the strikeout department. At home, he has a monster 12.17 K/9, but on the road it falls to just 7.31/9.
• With the acquisition of OF Taylor Ward and the return of 2B Brendan Donovan, the Mariners' lineup has surprisingly few strikeout-heavy players. C Cal Raleigh and SS Colt Emerson are the only two regular starters with a K-rate above 20.8%.
• Jax began the season as a reliever, so the Rays tend not to push him past 80 pitches or so. Additionally, it's worth noting that he faced the Mariners at home about a month ago and recorded 3 strikeouts in 5 innings of work.

Add Griffin Jax to your PrizePicks Lineup now.

{{mlb_offer_banner="/style-system/ui-components-playbook"}}

Mariners P George Kirby vs. Rays: 92.5 Pitches Thrown

• Kirby is averaging just 86.5 pitches per game, a full 6 pitches below his current projection. He's thrown fewer than 92.5 pitches in five of his last seven starts.
• With this shaping up to be an incredibly important game for the Mariners, it wouldn't be surprising to see them be aggressive with their bullpen should Kirby start to falter.
• SP Logan Gilbert went 6.2 innings last night, leaving the pen and specifically the high-leverage arms ready to roll should they be needed tonight.
• With how dominant the Mariners' bullpen has been, it's just another reason that we could see manager Dan Wilson deploy them early in what might be a closely contested game.

Add George Kirby to your PrizePicks Lineup now.

Make Rays vs. Mariners Picks on PrizePicks

The Rays have been juggernauts all season and can go for the series win tonight with a victory in the Pacific Northwest. Can they secure back-to-back road triumphs against a desperate Mariners team that is locked into a tight three-club race for the AL West lead?

Don’t wait until lock — make your Rays vs. Mariners picks on PrizePicks now and earn real money if you’re right.

Pick players, predict More or Less on their stats, and cash in if you’re right. With Team Picks, you can make predictions on MLB game winners, spreads, and over/unders, now available in 36 states.

Stay locked in on Playbook for daily MLB predictions, picks, and news every day all the way through the 2026 MLB World Series.