Oakland Athletics vs Seattle Mariners All-Time Record

AL West rivalry
Oakland Athletics
Seattle Mariners
Athletics lead Mariners396to365since 1977

Retrosheet history through 2025, plus 13 final games from the current feed.

2026 season series: Athletics lead 7-6

By

Data updated 6 min read

At a glance

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

Oakland Athletics vs Seattle Mariners insights

Current-feed record
+39wins for Mariners
54% Mariners · 46% Athletics

Mariners have pulled further ahead since 2023: 34-18.

Recent form
10-10last 20

Athletics won 8-7 on Sep 13, 2026

Where it matters
0Postseason games

No postseason meetings since 2002.

Schedule context
  • Mariners built the series lead before the 2023 schedule change, taking 206 of 389 decided meetings (53%).
  • Since the schedule balanced out they are 34-18, or 65% to Mariners.

Athletics vs Mariners complete all-time series record

Oakland Athletics and Seattle Mariners have met 761 times since 1977, never in the postseason. 320 meetings predate the current feed, which adds game-level detail from 2002.

History span
1977 to 2026
First and latest meeting
Before 2002
320
Meetings from the Retrosheet game logs
Since 2002
441
Meetings with game-level detail below
Win Percentage
201W
240W
OAK
SEA
46%54%
Oakland AthleticsSeattle Mariners

Recent Games

Last 10 Games
Sep 13
OAK 8-7 SEA
OAK
Sep 12
OAK 1-19 SEA
SEA
Sep 11
OAK 6-5 SEA
OAK
Sep 6
SEA 2-0 OAK
SEA
Sep 5
SEA 2-6 OAK
OAK
Sep 4
SEA 6-7 OAK
OAK
Sep 3
SEA 4-7 OAK
OAK
May 27
OAK 1-9 SEA
SEA
May 26
OAK 1-4 SEA
SEA
May 25
OAK 2-9 SEA
SEA
Last Meeting
Sep 13, 2026Final
OAK
8
HOME
SEA
7
AWAY
Athleticswon by1run
Snapped Mariners' streak·Game 441 since 2002
Streaks & Momentum
Current Streak
Oakland Athletics won the most recent meeting
1
Avg. Margin of Victory
Games decided by 3.2 runs on average
3.2runs
Momentum (Last 10 vs Archive since 2002)
OAK-Neutral
Last 1050%
Archive since 200245.6%
SEA-Neutral
Last 1050%
Archive since 200254.4%
Last 10 Results
OAK / SEA

Record since 2002

Season Split & Biggest Wins
Regular season vs Postseason record, plus each team's largest margin of victory
Regular Season441 games
201
240
No postseason meetings appear since 2002.
Oakland Athletics Biggest Win
12–0+12 runs
Sep 21, 2003
Seattle Mariners Biggest Win
19–1+18 runs
Sep 12, 2026
Decade Breakdown
Choose a decade to scope the current-feed page
Season by Season
Season ↓OAK ↕SEA ↕Games ↕
20267613
20256713
20244913
202311213
202281119
202141519
20206410
201910919
201891019
201771219
201671219
201561319
201491019
201381119
201212719
201191019
201013619
200951419
200810919
200751419
200617219
200512618
200411819
200371219
200281119

All 25 seasons are shown in the table above.

Home / Away Split
102-115OAK HOME125-99SEA HOME
AWAY
99-125
OAK
AWAY
115-102
SEA
Retrosheet archiveComplete through 2025

Oakland Athletics 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
748
Peak inning
3
Record game
27 runs
Two source windows. Current-feed sections: 441 games from 2002 to 2026. History Lab: 748 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
31.5%

Share of the 441 decided meetings settled by exactly one run.

Won by 2 or more
68.5%

A 2+ run margin crosses 1.5, but this is not a historical line result. Average gap: 3.2.

Average total
8.2runs

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

Home side wins
51.5%

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 even233208
52.8%
8.5194247
44%
9.5151290
34.2%

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.

Seattle Mariners
240 W · 54.4%1.84
Oakland Athletics
201 W · 45.6%2.19

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
40%vs 31.5% full archive
+8.5% in the last 20
Won by 2 or more
60%vs 68.5% full archive
-8.5% in the last 20
Average total
9.3 runsvs 8.2 runs full archive
+1.1 runs in the last 20

Seasons 2025 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 Mariners and Athletics in the oddsmatcher.

Questions about this record: Oakland Athletics vs Seattle Mariners

How do recent Oakland Athletics vs Seattle Mariners results compare with the complete record?

The latest 10 decided meetings are split 5-5. Oakland Athletics lead the decided record 396-365. The recent window is a subset of the complete series from 1977 through 2026, so the page reports the two separately.

When did the Oakland Athletics and Seattle Mariners first play each other?

The Retrosheet archive's first recorded meeting for this pairing is May 19, 1977, when Seattle Mariners won 3-0 away to Oakland Athletics. The archive covers 748 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

Oakland Athletics and Seattle Mariners have met 441 times in this archive, which covers the 2002 season onward.