Mariners vs. Nationals Dunkel MLB Picks, Predictions and Prop Bets - June 12

The Seattle Mariners and Washington Nationals clash on Friday at 6:45 p.m. ET, opening a three-game series at Nationals Park. Bryce Miller (2-0, 1.33 ERA) gets the start for the Mariners, who are 36-34 this season and first in the AL West. Zack Littell (6-4, 4.76 ERA) is starting for the Nationals, who are 35-34 and third in the NL East.

Despite being the away team the Mariners are a moderate moneyline favorite (-149) over the Nationals (+124). The contest has an over/under set at 9.

Mariners vs. Nationals Odds, Game Time

• Game day: Friday, June 12, 2026
• Game time: 6:45 p.m. ET
• Location: Washington D.C.
• Stadium: Nationals Park
• Favorite: Mariners (-149)
• Underdog: Nationals (+124)
• Over/under: 9

How to Watch Mariners vs. Nationals

• TV Channel: NATS and SEAM
• Live Stream: Fubo (Watch for free)

Bet now on FanDuel Sportsbook!

Mariners vs. Nationals: Betting the Moneyline

• The Mariners have put together a 34-30 record in games they were listed as the moneyline favorite (winning 53.1% of those games).
• Washington has been victorious in 33, or 52.4%, of the 63 contests it has been chosen as underdogs in this season.
• Seattle has a record of 12-7, a 63.2% win rate, when favored by -149 or more by sportsbooks this season.
• This season, the Nationals have come away with a win 18 times in 35 chances when named as an underdog of at least +124 or longer on the moneyline.
• The Mariners have an implied moneyline win probability of 59.8% in this game.
• The moneyline set for this matchup implies the Nationals have a 44.6% chance of coming away with a victory in the contest.

Mariners vs. Nationals: Betting the Spread & Total

• In the 70 games in which oddsmakers have set an over/under for the Mariners, they have combined with opponents to go over the total 33 times (33-34-3).
• Washington and its opponents have gone over the total this season in 42 of its 69 opportunities.
• The Mariners have a 26-44-0 record ATS this season (covering only 37.1% of the time).
• The Nationals have posted a record of 43-26-0 against the spread this season.