Cleveland Guardians vs Seattle Mariners All-Time Record

American League
Cleveland Guardians
Seattle Mariners
Guardians lead Mariners254to210since 1977

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

2026 season series: Guardians lead 4-3

By

Data updated 6 min read

At a glance

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

Cleveland Guardians vs Seattle Mariners insights

Current-feed record
+2wins for Guardians
51% Guardians · 49% Mariners

The split has held steady across the schedule change: 14-12 since 2023.

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

Guardians won 6-5 on Jun 28, 2026

Where it matters
0Postseason games

No postseason meetings since 2002.

Schedule context
  • Guardians built the series lead before the 2023 schedule change, taking 77 of 154 decided meetings (50%).
  • Since the schedule balanced out they are 14-12, or 54% to Guardians.

Guardians vs Mariners postseason head-to-head record

Cleveland Guardians and Seattle Mariners have met 464 times since 1977, 11 times in the postseason. The playoff games are included in the all-time total, not added on top of it.

Postseason record
Guardians 6-5
11 postseason games since 1977
Playoff share
2.4%
Share of all meetings
Regular season
453
Recorded non-postseason meetings
Win Percentage
91W
89W
CLE
SEA
51%49%
Cleveland GuardiansSeattle Mariners

Recent Games

Last 10 Games
Jun 28
CLE 6-5 SEA
CLE
Jun 27
CLE 4-3 SEA
CLE
Jun 26
CLE 1-3 SEA
SEA
Mar 29
SEA 8-0 CLE
SEA
Mar 28
SEA 5-6 CLE
CLE
Mar 27
SEA 5-1 CLE
SEA
Mar 26
SEA 4-6 CLE
CLE
Aug 31
CLE 2-4 SEA
SEA
Aug 30
CLE 4-3 SEA
CLE
Aug 29
CLE 5-4 SEA
CLE
Last Meeting
Jun 28, 2026Final
CLE
6
HOME
SEA
5
AWAY
Guardianswon by1run
Guardians' 2nd straight in this series·Game 180 since 2002
Streaks & Momentum
Current Streak
Cleveland Guardians: 2 consecutive wins
2
Avg. Margin of Victory
Games decided by 3.2 runs on average
3.2runs
Momentum (Last 10 vs Archive since 2002)
CLE-Neutral
Last 1060%
Archive since 200250.6%
SEA-Neutral
Last 1040%
Archive since 200249.4%
Last 10 Results
CLE / SEA

Record since 2002

Season Split & Biggest Wins
Regular season vs Postseason record, plus each team's largest margin of victory
Regular Season180 games
91
89
No postseason meetings appear since 2002.
Cleveland Guardians Biggest Win
18–6+12 runs
Jul 16, 2004
Seattle Mariners Biggest Win
10–0+10 runs
May 5, 2019
Decade Breakdown
Choose a decade to scope the current-feed page
Season by Season
Season ↓CLE ↕SEA ↕Games ↕
2026437
2025246
2024426
2023437
2022167
2021347
2019516
2018257
2017426
2016347
2015437
2014246
2013527
2012448
2011549
2010347
20096410
2008459
2007437
2006459
20057310
2004549
2003369
2002347

All 24 seasons are shown in the table above.

Home / Away Split
44-46CLE HOME43-47SEA HOME
AWAY
47-43
CLE
AWAY
46-44
SEA
Retrosheet archiveComplete through 2025

Cleveland Guardians 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
457
Peak inning
4
Record game
29 runs
Two source windows. Current-feed sections: 180 games from 2002 to 2026. History Lab: 457 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
32.2%

Share of the 180 decided meetings settled by exactly one run.

Won by 2 or more
67.8%

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

Average total
8.6runs

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

Home side wins
48.3%

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
7.59882
54.4%
8.5Closest to even8595
47.2%
9.566114
36.7%

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.

Cleveland Guardians
91 W · 50.6%1.98
Seattle Mariners
89 W · 49.4%2.02

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 32.2% full archive
+7.8% in the last 20
Won by 2 or more
60%vs 67.8% full archive
-7.8% in the last 20
Average total
8.4 runsvs 8.6 runs full archive
-0.2 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 Guardians and Mariners in the oddsmatcher.

Questions about this record: Cleveland Guardians vs Seattle Mariners

What is the Cleveland Guardians vs Seattle Mariners postseason record?

The postseason subset contains 11 games: Cleveland Guardians have 6 wins and Seattle Mariners have 5 wins. Those games are already included in the complete series from 1977 through 2026.

When did the Cleveland Guardians and Seattle Mariners first play each other?

The Retrosheet archive's first recorded meeting for this pairing is May 24, 1977, when Cleveland Guardians beat Seattle Mariners 7-5 at home. The archive covers 457 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

Cleveland Guardians and Seattle Mariners have met 180 times in this archive, which covers the 2002 season onward.