Seattle Mariners // 2025 Champions → 2026 Implosion

THE IMPLOSION

One year ago: 90 wins, an AL West title, the first since 2001. This year: a historic implosion - 66-76, third in the AL West, a 24-win drop from 2025 and 100-plus losses projected. The full fall, rendered.

902025 wins - AL West champs
662026 wins - 3rd AL West
14win drop from 2025
7sweeps suffered (5 won)
season 2026 division AL West record 66-75 pace 76-86 thru Sep 4
scroll

THE COLLAPSE

Seven checkpoints, month by month, the way a season unwinds. Each step is one month of 2026 - the record, the win percentage, and what it meant. The slide was not one bad week. It was six in a row of slow bleeds.

  1. 01

    March 11-16

    Mediocre opener; no early momentum. The champions opened the season flat, and the cushion from 2025 started spending itself.

    11W 16L .407 - below the bar
  2. 02

    April 13-14

    Mediocre but salvageable. Two sweeps against in the first five series kept the season honest early.

    13W 14L .481 - still salvageable
  3. 03

    May 15-13

    Above .500 but no cushion built. Two sweeps won and one taken - the team looked fine. That was the last time it would look fine.

    15W 13L .536 - peak of the year
  4. 04

    June 12-14

    Lead evaporated. Flipped to third. The division edge that 2025 built spent itself in a month.

    12W 14L .462 - lead gone
  5. 05

    July 10-14

    15 losses. The collapse became critical - and 14 of them landed in a single month. The division title race was over by the time the sun went down.

    10W 14L .417 - the collapse
  6. 06

    August 11-17

    Elimination risk rises daily. Another 0-3 sweep, another 1-2 grind. The season stopped being a question of how bad.

    11W 17L .393 - worst month
  7. 07

    The Outlook 76-86

    Projected full-season pace: 76-86. A 14-win drop from 2025, 100-plus losses on the board, and a division title that took 25 years to win again gone in a single summer.

    proj 76-86 - a 14-win drop

THE PACE

The cumulative win percentage across 38 checkpoints from game 4 to game 122 - the line that tells the whole story. It never stops drifting down, and it never comes back above .500 for good.

Cumulative Win Percentage game 4 → game 122 · teal = 2026 line · gold = .500

Monthly Win % mar → aug · aqua = over .500 · red = under

Season Series 38 series · by result

THE GAUGES

Three gauges, three ways to measure the fall. The aqua arc is 2025, the red arc is 2026 - watch the arcs sweep as you scroll.

55.6% → 46.8% win pct

SEASON WIN PCT

90-72 (2025) → 66-75 (2026)
−14 WINS 55.6% → 46.8%
2025 90-72 / .556AL WEST CHAMPS2026 66-75 / .468

The big one. The 2025 Mariners were the AL West champions - the first division title since 2001. Twelve months later the same nucleus is third with a 14-win drop and 100-plus losses projected. Win percentage fell from .556 to .468 in a single season.

2025 AL West champions · 2026 3rd · projected 76-86

CAL RALEIGH (C)

franchise cornerstone
−49 HR 60 → 11
2025 60 HRMLB RECORD2026 11 HR

The crown jewel dimmed. A 60-HR season - an MLB record - plus a Silver Slugger became 11 homers, well off that pace. When your best player loses 49 home runs in a year, the drop-off is structural, not temporary.

THE SLIDE WINDOW

may to aug win pct
−14.3 PTS .536 → .393
MAY 15-13PEAK .536AUG 11-17

From .536 in May to .393 in August - the steepest three-month slide of the year. June, July and August compounded into a season that was no longer salvageable, and the run differential went deeply negative with it.

THE RECEIPT

The season log, series by series, replayed line by line - every sweep, every grind, every split. Hover the terminal to pause. Hit replay to watch the season fall again.

season log - 38 series @ thru aug 9
66-75 · .468 · 5 sweeps won · 7 suffered · 14L july
the months, by the month

THE NUCLEUS

The core that won it all in 2025 - Raleigh, Julio, Arozarena, Woo, Munoz - and what happened to it in twelve months. 2024: Wild Card berth. 2025: AL West champions. 2026: third place with a projected 100-plus losses. A fall from champion to last-place-adjacent in twelve months represents a severe organizational collapse.

Cal Raleigh (C) the slide
60 → 11 HR
2025: 60 HR - an MLB record - plus a Silver Slugger. 2026: 11 HR, well off the 60-HR pace. Diminished impact from the best player on the roster.
Julio Rodriguez faded
great → ok
From great to merely acceptable. The everyday star became a baseline player - the single most expensive regression on the team.
Randy Arozarena regression
breakout → ?
Regression from breakout years. The swing that carried the 2025 run did not carry 2026.
Brayan Woo deterioration
starter → spot
Performance deterioration. The back-end starter who gave the bullpen room to breathe stopped doing it.
Andres Munoz deterioration
rotation → spot
Performance deterioration. June-July composite: the drop-off became structural rather than temporary.
Run Differential negative
deeply −
Deeply negative, indicating broader pitching and run-prevention failures - not one position, but the whole machine. The division lead evaporated during June and July.

THE FULL SERIES

Every series of 2026 - spring training through the in-progress September set. 77 series, no edits. Scroll the table; the season is in there.

#DatesOpponentGamesW-LResult