Mariners vs Diamondbacks Prediction, Odds, Moneyline, Spread & Over/Under for May 29

Odds updated as of 10:13 a.m.

The Friday slate in MLB includes a matchup between the Seattle Mariners and the Arizona Diamondbacks.

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

Mariners vs Diamondbacks Game Info

• Seattle Mariners (28-29) vs. Arizona Diamondbacks (31-24)
• Date: Friday, May 29, 2026
• Time: 10:10 p.m. ET
• Venue: T-Mobile Park -- Seattle, Washington
• Coverage: Mariners.TV and Dbacks.TV

Mariners vs Diamondbacks Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-152) | ARI: (+128)
• Spread: SEA: -1.5 (+138) | ARI: +1.5 (-166)
• Total: 7.5 -- Over: (+102) | Under: (-124)

Mariners vs Diamondbacks Probable Starting Pitchers

Probable Pitchers: George Kirby (Mariners) - 5-4, 3.54 ERA vs Zac Gallen (Diamondbacks) - 3-4, 4.80 ERA

This contest's pitching matchup is set, as the Mariners will send George Kirby (5-4) to the mound, while Zac Gallen (3-4) will answer the bell for the Diamondbacks. Kirby's team is 5-6-0 against the spread this season in his starts. When Kirby starts a game and his team is the favorite on the moneyline, they have a record of 6-5. The Diamondbacks have gone 6-5-0 ATS in Gallen's 11 starts that had a set spread. The Diamondbacks have been the moneyline underdog in six of Gallen's starts this season, and they went 2-4 in those games.

Mariners vs Diamondbacks Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (60.8%)

Mariners vs Diamondbacks Moneyline

• The moneyline numbers for Mariners vs. Diamondbacks reveal Seattle as the favorite (-152) and Arizona as the underdog (+128) on the road.

Mariners vs Diamondbacks Spread

• The Diamondbacks are +1.5 on the spread (-166 to cover), and Seattle is +138 to cover the runline.

Mariners vs Diamondbacks Over/Under

• Mariners versus Diamondbacks on May 29 has an over/under of 7.5 runs, with the odds on the over +102 and the under set at -124.

Bet on Seattle Mariners vs. Arizona Diamondbacks on FanDuel today!

Mariners vs Diamondbacks Betting Trends

• The Mariners have been favorites in 52 games this season and have come away with the win 26 times (50%) in those contests.
• This season Seattle has come away with a win 10 times in 16 chances when named as a favorite of at least -152 on the moneyline.
• The Mariners and their opponents have gone over in 26 of their 57 games with a total set by sportsbooks this season.
• The Mariners have an against the spread mark of 22-35-0 in 57 games with a line this season.
• The Diamondbacks have won 39.3% of the games this season they were the moneyline underdog (11-17).
• Arizona has a 4-6 record (winning 40% of its games) when it has played as a moneyline underdog of +128 or longer.
• The Diamondbacks have played in 54 games with a set over/under, and have combined with opponents to go over the total 27 times (27-25-2).
• The Diamondbacks have put together a 32-22-0 record ATS this season.

Mariners Player Leaders

• Randy Arozarena has 61 hits and an OBP of .382 to go with a slugging percentage of .464. All three of those stats rank first among Seattle hitters this season. He has a .295 batting average, as well.
• He ranks 19th in batting average, 21st in on-base percentage, and 43rd in slugging among qualifying batters in MLB.
• Arozarena has recorded at least one hit in four straight games. In his last five games he is hitting .261 with two doubles, a home run and four RBIs.
• Julio Rodriguez is hitting .258 with 11 doubles, 10 home runs and 18 walks. He's slugging .437 with an on-base percentage of .317.
• Among all qualifying players, he ranks 71st in batting average, 103rd in on-base percentage and 61st in slugging percentage.
• Rodriguez heads into this matchup looking to extend his four-game hit streak. During his last five outings he is batting .227 with two home runs, a walk and six RBIs.
• Josh Naylor has 54 hits this season and has a slash line of .258/.322/.354.
• Naylor enters this game with four games in a row with at least one hit. In his last five games he is hitting .333 with a walk and two RBIs.
• J.P. Crawford has been key for Seattle with 36 hits, an OBP of .338 plus a slugging percentage of .359.
• Crawford has safely hit in four straight games. In his last five games he is batting .261 with a home run and three RBIs.

Diamondbacks Player Leaders

• Corbin Carroll has racked up 55 hits with a .392 on-base percentage, leading the Diamondbacks in both categories. He's batting .293 and slugging .553.
• Including all the qualifying hitters in the big leagues, his batting average is 22nd, his on-base percentage is 11th, and he is ninth in slugging.
• Ketel Marte leads his team with a .476 slugging percentage. He has a batting average of .276 with an on-base percentage of .326.
• Including all qualified hitters, he ranks 40th in batting average, 89th in on-base percentage and 35th in slugging percentage.
• Ildemaro Vargas is hitting .303 with nine doubles, two triples, seven home runs and seven walks.
• Nolan Arenado is batting .271 with 11 doubles, seven home runs and 18 walks.

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