Mariners vs Nationals Prediction, Odds, Moneyline, Spread & Over/Under for June 12

Odds updated as of 6:12 p.m.

The Friday slate in MLB includes a matchup between the Seattle Mariners and the Washington Nationals.

All the info you need to make smart wagers on this game at FanDuel Sportsbook can be found below. Check out all of the latest MLB betting lines here.

Mariners vs Nationals Game Info

• Seattle Mariners (36-34) vs. Washington Nationals (35-34)
• Date: Friday, June 12, 2026
• Time: 6:45 p.m. ET
• Venue: Nationals Park -- Washington, District of Columbia
• Coverage: Nationals.TV and Mariners.TV

Mariners vs Nationals Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-146) | WSH: (+124)
• Spread: SEA: -1.5 (+112) | WSH: +1.5 (-134)
• Total: 9.5 -- Over: (-104) | Under: (-118)

Mariners vs Nationals Probable Starting Pitchers

Probable Pitchers: Bryce Miller (Mariners) - 2-0, 1.33 ERA vs Zack Littell (Nationals) - 6-4, 4.76 ERA

The Mariners will call on Bryce Miller (2-0) versus the Nationals and Zack Littell (6-4). Miller and his team have a record of 1-3-0 against the spread when he starts. Miller's team is 2-2 this season when he starts and they are the moneyline favorite. When Littell starts, the Nationals have gone 6-3-0 against the spread. The Nationals have been the moneyline underdog in nine of Littell's starts this season, and they went 6-3 in those games.

Mariners vs Nationals Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (59.5%)

Mariners vs Nationals Moneyline

• Washington is a +124 underdog on the moneyline, while Seattle is a -146 favorite on the road.

Mariners vs Nationals Spread

• The Nationals are +1.5 on the spread (-134 to cover), and Seattle is +112 to cover the runline.

Mariners vs Nationals Over/Under

• The over/under for Mariners-Nationals on June 12 is 9.5. The over is -104, and the under is -118.

Bet on Seattle Mariners vs. Washington Nationals on FanDuel today!

Mariners vs Nationals Betting Trends

• The Mariners have been chosen as favorites in 64 games this year and have walked away with the win 34 times (53.1%) in those games.
• This year Seattle has won 13 of 22 games when listed as at least -146 on the moneyline.
• The Mariners and their opponents have hit the over in 33 of their 70 games with a total set by oddsmakers this season.
• The Mariners are 26-44-0 against the spread in their 70 games that had a posted line this season.
• The Nationals have won 53.2% of the games this season they were the moneyline underdog (33-29).
• When it has played as a moneyline underdog with odds of +124 or longer, Washington has an 18-17 record (winning 51.4% of its games).
• The Nationals have played in 69 games with an over/under set, and have combined with opponents to go over the total 42 times (42-24-3).
• The Nationals have a 42-27-0 record ATS this season.

Mariners Player Leaders

• Randy Arozarena leads Seattle in OBP (.377), slugging percentage (.448) and total hits (75) this season. He has a .290 batting average.
• Among the qualified hitters in the majors, his batting average ranks 20th, his on-base percentage ranks 21st, and he is 58th in slugging.
• Julio Rodriguez is hitting .254 with 14 doubles, 13 home runs and 23 walks, while slugging .442 with an on-base percentage of .314.
• Among qualifying hitters, he is 76th in batting average, 107th in on-base percentage and 64th in slugging percentage.
• Josh Naylor has 66 hits this season and has a slash line of .257/.322/.366.
• Cole Young has been key for Seattle with 64 hits, an OBP of .321 plus a slugging percentage of .363.
• Young has hit safely in two games in a row. During his last five outings he is hitting .304 with a home run and two RBIs.

Nationals Player Leaders

• James Wood has an on-base percentage of .407 and has 71 hits, both team-best marks for the Nationals. He's batting .271 and slugging .534.
• Including all qualified hitters, he is 49th in batting average, while his on-base percentage is fifth and he is 14th in slugging.
• Wood hopes to build on a three-game hitting streak in this matchup. In his last five games he is hitting .316 with a home run, four walks and three RBIs.
• C.J. Abrams has 13 doubles, two triples, 14 home runs and 29 walks while hitting .287. He's slugging .526 with an on-base percentage of .378.
• Including all qualifying hitters, his batting average places him 22nd, his on-base percentage is 18th, and he is 17th in slugging.
• Daylen Lile has a slugging percentage of .424, a team-high for the Nationals.
• Luis Garcia has 12 doubles, three triples, eight home runs and eight walks while batting .264.

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