Mariners vs Nationals Prediction, Odds, Moneyline, Spread & Over/Under for June 13

Odds updated as of 11:12 p.m.

MLB action on Saturday includes the Seattle Mariners taking on the Washington Nationals.

Before you do any MLB betting on this matchup at FanDuel Sportsbook, here's what you need to know.

Mariners vs Nationals Game Info

• Seattle Mariners (36-34) vs. Washington Nationals (35-34)
• Date: Saturday, June 13, 2026
• Time: 4:05 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: (-148) | WSH: (+126)
• Spread: SEA: -1.5 (+112) | WSH: +1.5 (-134)
• Total: 9.5 -- Over: (-102) | Under: (-120)

Mariners vs Nationals Probable Starting Pitchers

Probable Pitchers: Luis Castillo (Mariners) - 2-5, 5.16 ERA vs Cade Cavalli (Nationals) - 3-4, 3.88 ERA

This contest's pitching matchup is set, as the Mariners will send Luis Castillo (2-5) to the mound, while Cade Cavalli (3-4) will answer the bell for the Nationals. When Castillo starts, his team is 3-8-0 against the spread this season. Castillo's team is 3-6 this season when he starts and they are the moneyline favorite. The Nationals have an 8-6-0 ATS record in Cavalli's 14 starts that had a set spread. The Nationals have been the underdog on the moneyline in 11 of Cavalli's starts this season, and they went 3-8 in those games.

Mariners vs Nationals Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (56.4%)

Mariners vs Nationals Moneyline

• Seattle is a -148 favorite on the moneyline, while Washington is a +126 underdog at home.

Mariners vs Nationals Spread

• The Nationals are +1.5 on the run line against the Mariners. The Nationals are -134 to cover, and the Mariners are +112.

Mariners vs Nationals Over/Under

• Mariners versus Nationals on June 13 has an over/under of 9.5 runs, with the odds on the over -102 and the under set at -120.

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Mariners vs Nationals Betting Trends

• The Mariners have come away with 34 wins in the 64 contests they have been listed as the favorites in this season.
• This year Seattle has won 12 of 19 games when listed as at least -148 on the moneyline.
• The Mariners and their opponents have gone over in 33 of their 70 games with a total set by sportsbooks this season.
• The Mariners are 26-44-0 against the spread in their 70 games with a line set by sportsbooks this season.
• The Nationals have won 33 of the 62 games they were the moneyline underdog this season (53.2%).
• When it has played as a moneyline underdog with odds of +126 or longer, Washington has gone 16-17 (48.5%).
• The Nationals have had an over/under set by oddsmakers 69 times, and have combined with opponents to go over the total in 42 of those games (42-24-3).
• The Nationals have gone 42-27-0 ATS this season.

Mariners Player Leaders

• Randy Arozarena has 75 hits and an OBP of .377 to go with a slugging percentage of .448. All three of those stats lead Seattle hitters this season. He has a .290 batting average, as well.
• Among all qualified hitters in baseball, he ranks 19th in batting average, 22nd in on-base percentage, and 58th in slugging.
• Julio Rodriguez is batting .254 with 14 doubles, 13 home runs and 23 walks. He's slugging .442 with an on-base percentage of .314.
• He is 77th in batting average, 108th in on-base percentage and 65th in slugging among qualifying hitters.
• 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 safely hit in two straight games. In his last five games he is batting .304 with a home run and two RBIs.

Nationals Player Leaders

• James Wood has accumulated an on-base percentage of .407 and has 71 hits, both team-best numbers for the Nationals. He's batting .271 and slugging .534.
• Including all qualified hitters, he ranks 50th in batting average, while his on-base percentage ranks fifth and he is 15th 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 is hitting .287 with 13 doubles, two triples, 14 home runs and 29 walks. He's slugging .526 with an on-base percentage of .378.
• He is currently 22nd in batting average, 18th in on-base percentage and 20th in slugging percentage among all qualifying hitters.
• Daylen Lile has racked up a team-best .424 slugging percentage.
• Luis Garcia is batting .264 with 12 doubles, three triples, eight home runs and eight walks.

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