MLB Prop Bets: Washington Nationals vs Seattle Mariners (June 12, 2026)
The Seattle Mariners (36-34) face the Washington Nationals (35-34) at Nationals Park on Friday at 6:45pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Bryce Miller is the probable pitcher for the Mariners, while Zack Littell is the probable pitcher for the Nationals. The Mariners are favored to win at -149, while the Nationals are at +124. The total runs line is set at 9.5, with OVER at +100 and UNDER at -120.
- The Mariners (+108) have a 29-41 Run Line record this season, while the Nationals (-131) hold a record of 44-25.
- The Mariners have a 33-33-4 O/U record this season (meaning 33 games have gone over the total runs line, 33 have gone under and four have resulted in a push). The Nationals have a 42-25-2 O/U record.
Scoring Insights
- The Mariners are averaging 4.2 runs per game this season (20th in the league). Comparatively, the Nationals are averaging +1.1 more at 5.4 runs (2nd).
- In the field, the Mariners are allowing only 3.9 runs per game this season (6th in the league), while the Nationals are allowing an average of 5.3 runs (29th).
Let's take a look at how these teams perform in some other key statistical areas.
Batting Insights:
Batting Average
- Looking at their batting averages this season, the Mariners are at .237 (ranking 23rd in the Major leagues), while the Nationals are batting .246 (10th).
Home Runs
- In terms of total home runs this season, the Nationals have hit 89 (6th in the Major Leagues). Meanwhile, the Mariners have managed 90 (5th).
Runs Batted In
- Finally, looking at their runs batted in, the Mariners have recorded 290 RBIs to rank 13th in the MLB this season. Comparatively, the Nationals have recorded 352 RBIs to rank 1st.
Pitching Insights:
Earned Run Average
- The Mariners have one of the strongest earned run averages this season, sitting at 3.59 (5th in the Majors), while the Nationals are at the opposite end of the scale with an ERA of 4.66 (25th).
Strikeouts
- Turning our attention to total strikeouts, the Mariners have recorded 602 this season, ranking 9th in the MLB. Meanwhile, the Nationals rank 25th for total strikeouts, recording 537.
Opponent Batting Average
- Opponents are batting an average of .255 against the Nationals this season (26th in the Major Leagues). Comparatively, the Mariners' opponents are at .241 (15th).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 19-15-36 | 11-9-15 | 8-6-21 | 19-14-30 | 0-1-6 | 0-0-0 | 2-1-7 |
| Nationals | 21-13-35 | 10-7-15 | 11-6-20 | 2-2-3 | 19-11-32 | 0-0-0 | 3-2-5 |
Lead After Three Innings
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 32-22-16 | 18-10-7 | 14-12-9 | 27-21-15 | 5-1-1 | 0-0-0 | 4-4-2 |
| Nationals | 27-22-20 | 12-11-9 | 15-11-11 | 4-0-3 | 23-22-17 | 0-0-0 | 5-0-5 |
NRFI/YRFI
The NRFI market is paying +100 and the YRFI is paying -130.
- The NRFI is 32-38 in Mariners games this season. The Nationals have a 35-34 NRFI record.
Last Time They Met
The Nationals recorded a 9-3 extra innings victory over the Mariners at T-Mobile Park when these teams last met on May 29, 2025. Josh Bell was unstoppable in that matchup, hitting a home run, a single and recording 3 RBIs.
