Seattle Mariners vs Washington Nationals H2H Record

Interleague
Seattle Mariners
Washington Nationals
Nationals lead Mariners24to13since 2002

Current-feed record from 2002 through 2026.

2026 season series: Nationals lead 2-1

By

Data updated 4 min read

At a glance

Current-feed analysis, 2002 to 2026

Seattle Mariners vs Washington Nationals insights

Current-feed record
+11wins for Nationals
65% Nationals · 35% Mariners

The split has held steady across the schedule change: 8-4 since 2023.

Recent form
9-11last 20
Nationals on a 2-game streak

Nationals won 10-1 on Jun 14, 2026

Where it matters
0Postseason games

No postseason meetings since 2002.

Schedule context
  • Nationals built the series lead before the 2023 schedule change, taking 16 of 25 decided meetings (64%).
  • Since the schedule balanced out they are 8-4, or 67% to Nationals.

Mariners vs Nationals interleague history by season

Seattle Mariners and Washington Nationals met in 12 seasons inside the current feed. Interleague scheduling makes meeting frequency uneven, so the season table matters more than a raw average.

Active seasons
12
With at least one meeting since 2002
Busiest season
2022
4 meetings
Per active season
3.1
Uneven interleague cadence
Win Percentage
13W
24W
SEA
WSH
35%65%
Seattle MarinersWashington Nationals

Recent Games

Last 10 Games
Jun 14
WSH 10-1 SEA
WSH
Jun 13
WSH 8-3 SEA
WSH
Jun 12
WSH 2-10 SEA
SEA
May 29
SEA 3-9 WSH
WSH
May 28
SEA 0-9 WSH
WSH
May 27
SEA 9-1 WSH
SEA
May 26
WSH 5-9 SEA
SEA
May 25
WSH 3-1 SEA
WSH
May 24
WSH 6-1 SEA
WSH
Jun 28
SEA 1-4 WSH
WSH
Last Meeting
Jun 14, 2026Final
WSH
10
HOME
SEA
1
AWAY
Nationalswon by9runs
Nationals' 2nd straight in this series·Game 37 since 2002
Streaks & Momentum
Current Streak
Washington Nationals: 2 consecutive wins
2
Avg. Margin of Victory
Games decided by 3.6 runs on average
3.6runs
Momentum (Last 10 vs Archive since 2002)
SEA-Neutral
Last 1030%
Archive since 200235.1%
WSH-Neutral
Last 1070%
Archive since 200264.9%
Last 10 Results
SEA / WSH

Record since 2002

Season Split & Biggest Wins
Regular season vs Postseason record, plus each team's largest margin of victory
Regular Season37 games
13
24
No postseason meetings appear since 2002.
Seattle Mariners Biggest Win
9–1+8 runs
May 27, 2025
Washington Nationals Biggest Win
10–1+9 runs
May 23, 2017
Decade Breakdown
Choose a decade to scope the current-feed page
Season by Season
Season ↓SEA ↕WSH ↕Games ↕
2026123
2025123
2024123
2023123
2022314
2017123
2014123
2011033
2008033
2005033
2004303
2003123

All 12 seasons are shown in the table above.

Home / Away Split
8-12SEA HOME12-5WSH HOME
AWAY
5-12
SEA
AWAY
12-8
WSH

Betting Context

Betting context since 2002

How this pairing has settled: run margins, totals and break-even prices derived from its historical record. These are final-score frequencies, not results against a closing line. We do not hold historical sportsbook prices for these games.

Small sample: 37 decided meetings, under the 50 we treat as the floor for a stable rate. Read the figures below as description, not a forecast. Interleague pairs meet in short bursts, so a single series can move any percentage here by several points.

One-run games
24.3%

Share of the 37 decided meetings settled by exactly one run.

Won by 2 or more
75.7%

A 2+ run margin crosses 1.5, but this is not a historical line result. Average gap: 3.6.

Average total
7.5runs

Final-score average without accounting for park, bullpen or weather.

Home side wins
54.1%

Share of decided meetings won by the listed home team.

Totals ladder

Where the combined score landed against the half-run lines a book normally posts. Half runs cannot push, so every meeting falls on one side.

LineOverUnderOver rate
7.5Closest to even1918
51.4%
8.51720
45.9%
9.51522
40.5%

Fair price from the base rate

The decimal price that corresponds exactly to each club's win share in this archive. It describes the record and does not estimate the next game.

Washington Nationals
24 W · 64.9%1.54
Seattle Mariners
13 W · 35.1%2.85

A base rate is not a forecast. Starting pitchers, lineups, injuries and venue all matter more to a single game than a multi-season head-to-head record.

Last 20 meetings vs full history

One-run games
5%vs 24.3% full archive
-19.3% in the last 20
Won by 2 or more
95%vs 75.7% full archive
+19.3% in the last 20
Average total
8.6 runsvs 7.5 runs full archive
+1.1 runs in the last 20

Seasons 2014 to 2026. The comparison shows whether the last 20 final scores differ from the longer archive, without assigning a cause or predicting what comes next.

View the break-even percentages in another odds format with the odds converter, or compare current prices for Nationals and Mariners in the oddsmatcher.

About Erik Andersson

Erik Andersson is SharkBetting's Content & Marketing Specialist. His published work focuses on betting methodology, market analysis, regulation and consumer education.

The source windows, derivations and update process for this data page are documented in the methodology above.

View full profile →

Methodology & Data Sources

Current MLB game logs come from the balldontlie API and cover the 2002 season onward. Scores and schedule anomalies are checked against the official MLB Stats API. Spring training is excluded, while results from earlier franchise identities are merged into the current club.

The betting context summarizes completed final scores only. It contains no sportsbook closing lines and summarizes only completed games. Report a possible error through our contact page with the matchup and game date.

Read the full H2H data methodology →

Last updated Sources: balldontlie, MLB Stats API

Seattle Mariners and Washington Nationals have met 37 times in this archive, which covers the 2003 season onward.