Baltimore Orioles vs Seattle Mariners All-Time Record

American League
Baltimore Orioles
Seattle Mariners
Orioles lead Mariners250to217since 1977

Retrosheet history through 2025, plus 7 final games from the current feed.

2026 season series: Mariners lead 4-3

By

Data updated 6 min read

At a glance

All-time since 1977 · current-feed analysis, 2002 to 2026

Baltimore Orioles vs Seattle Mariners insights

Current-feed record
+9wins for Orioles
52% Orioles · 48% Mariners

Orioles have pulled further ahead since 2023: 16-9.

Recent form
13-7last 20

Mariners won 3-0 on Jun 18, 2026

Where it matters
0Postseason games

No postseason meetings since 2002.

Schedule context
  • Orioles built the series lead before the 2023 schedule change, taking 80 of 158 decided meetings (51%).
  • Since the schedule balanced out they are 16-9, or 64% to Orioles.

Orioles vs Mariners postseason head-to-head record

Baltimore Orioles and Seattle Mariners have met 467 times since 1977, 4 times in the postseason. The playoff games are included in the all-time total, not added on top of it.

Postseason record
Orioles 3-1
4 postseason games since 1977
Playoff share
0.9%
Share of all meetings
Regular season
463
Recorded non-postseason meetings
Win Percentage
96W
87W
BAL
SEA
52%48%
Baltimore OriolesSeattle Mariners

Recent Games

Last 10 Games
Jun 18
SEA 3-0 BAL
SEA
Jun 17
SEA 3-5 BAL
BAL
Jun 16
SEA 3-1 BAL
SEA
Jun 11
BAL 7-5 SEA
BAL
Jun 10
BAL 7-2 SEA
BAL
Jun 9
BAL 5-6 SEA
SEA
Jun 8
BAL 3-6 SEA
SEA
Aug 14
BAL 5-3 SEA
BAL
Aug 13
BAL 4-3 SEA
BAL
Aug 12
BAL 0-1 SEA
SEA
Last Meeting
Jun 18, 2026Final
SEA
3
HOME
BAL
0
AWAY
Marinerswon by3runs
Snapped Orioles' streak·Game 183 since 2002
Streaks & Momentum
Current Streak
Seattle Mariners won the most recent meeting
1
Avg. Margin of Victory
Games decided by 2.9 runs on average
2.9runs
Momentum (Last 10 vs Archive since 2002)
BAL-Neutral
Last 1050%
Archive since 200252.5%
SEA-Neutral
Last 1050%
Archive since 200247.5%
Last 10 Results
BAL / SEA

Record since 2002

Season Split & Biggest Wins
Regular season vs Postseason record, plus each team's largest margin of victory
Regular Season183 games
96
87
No postseason meetings appear since 2002.
Baltimore Orioles Biggest Win
14–4+10 runs
May 23, 2006
Seattle Mariners Biggest Win
13–1+12 runs
Aug 30, 2003
Decade Breakdown
Choose a decade to scope the current-feed page
Season by Season
Season ↓BAL ↕SEA ↕Games ↕
2026347
2025516
2024426
2023426
2022246
2021347
2019347
2018167
2017426
2016167
2015336
2014527
2013246
2012819
2011426
2010369
2009459
20088210
2007279
20064610
20057310
2004729
2003459
2002549

All 24 seasons are shown in the table above.

Home / Away Split
51-37BAL HOME50-45SEA HOME
AWAY
45-50
BAL
AWAY
37-51
SEA
Retrosheet archiveComplete through 2025

Baltimore Orioles vs Seattle Mariners all-time record, 1977 to 2025

Explore how this matchup changed by decade, where each lineup produced its runs, and the games that pushed the rivalry record book. This archive is a separate source window from the current-feed sections above, which start in 2002.

Games
460
Peak inning
5
Record game
27 runs
Two source windows. Current-feed sections: 183 games from 2002 to 2026. History Lab: 460 Retrosheet games from 1977 to 2025. The first refreshes with current finals; Retrosheet's published archive currently ends in 2025.

Decade balance

Select an era to inspect pace, scoring and attendance.

The information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at www.retrosheet.org.

Open source archive

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.

One-run games
33.9%

Share of the 183 decided meetings settled by exactly one run.

Won by 2 or more
66.1%

A 2+ run margin crosses 1.5, but this is not a historical line result. Average gap: 2.9.

Average total
8.5runs

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

Home side wins
55.2%

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
7.510182
55.2%
8.5Closest to even8895
48.1%
9.567116
36.6%

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.

Baltimore Orioles
96 W · 52.5%1.91
Seattle Mariners
87 W · 47.5%2.10

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
30%vs 33.9% full archive
-3.9% in the last 20
Won by 2 or more
70%vs 66.1% full archive
+3.9% in the last 20
Average total
7.1 runsvs 8.5 runs full archive
-1.4 runs in the last 20

Seasons 2023 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 Orioles and Mariners in the oddsmatcher.

Questions about this record: Baltimore Orioles vs Seattle Mariners

What is the Baltimore Orioles vs Seattle Mariners postseason record?

The postseason subset contains 4 games: Baltimore Orioles have 3 wins and Seattle Mariners has 1 win. Those games are already included in the complete series from 1977 through 2026.

How do recent Baltimore Orioles vs Seattle Mariners results compare with the complete record?

The latest 10 decided meetings are split 5-5. Baltimore Orioles lead the decided record 250-217. The recent window is a subset of the complete series from 1977 through 2026, so the page reports the two separately.

When did the Baltimore Orioles and Seattle Mariners first play each other?

The Retrosheet archive's first recorded meeting for this pairing is May 6, 1977, when Baltimore Orioles beat Seattle Mariners 4-1 at home. The archive covers 460 meetings from 1977 through 2025. The current feed starts in 2002 and is reported separately.

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 all-time record and the History Lab use Retrosheet game logs through 2025, with inning lines, team totals, attendance, duration and ballpark fields when available. Final games after 2025 come from the current feed, and every section built on that feed alone is labeled as starting in 2002.

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, Retrosheet

Baltimore Orioles and Seattle Mariners have met 183 times in this archive, which covers the 2002 season onward.