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Major League Baseball history is built on moments — swings, pitches, and split-second plays that reshaped seasons and, in some cases, entire franchises. From walk-off home runs in winner-take-all games to clutch hits under October pressure, the biggest plays often came when the stakes were highest. identified the most impactful plays in Oakland Athletics history using data from . Plays were ranked by their Championship Win Probability Added (cWPA), a metric that measures how much a single play changed a team's odds of winning the World Series.

#10. October 17, 1911 (WS Gm 3)
- Score: down 1-0 (9th inning, 1 out)
- Opponent: SFG
- Event: HR
- Play Description: Home Run (Line Drive to Deep RF)
- cWPA: 13.13%

#9. October 14, 1973 (WS Gm 2)
- Score: down 6-5 (9th inning, 2 outs)
- Opponent: NYM
- Event: 1B
- Play Description: Single to LF; S. Bando Scores; R. Jackson to 2B
- cWPA: 13.24%

#8. October 07, 1972 (ALCS Gm 1)
- Score: down 2-1 (11th inning, 1 out)
- Opponent: DET
- Event: 1B
- Play Description: *WALK-OFF*:Single to RF (Ground Ball thru 2B-1B); M. Hegan Scores; G. Tenace Scores (Advanced on throw) on E9 (throw to 3B) (Unearned run)
- cWPA: 13.31%

#7. October 21, 1973 (WS Gm 7)
- Score: ahead 2-0 (3rd inning, 2 outs)
- Opponent: NYM
- Event: HR
- Play Description: Home Run (Deep CF-RF); J. Rudi Scores
- cWPA: 13.48%

#6. October 14, 1929 (WS Gm 5)
- Score: down 2-0 (9th inning, 1 out)
- Opponent: CHC
- Event: HR
- Play Description: Home Run (Fly Ball to Deep RF); M. Bishop Scores
- cWPA: 14.43%

#5. October 22, 1972 (WS Gm 7)
- Score: down 3-2 (8th inning, 2 outs)
- Opponent: CIN
- Event: Out
- Play Description: Popfly: LF (Short LF)
- cWPA: 16.71%

#4. October 22, 1972 (WS Gm 7)
- Score: tied 1-1 (6th inning, 2 outs)
- Opponent: CIN
- Event: 2B
- Play Description: Double to LF (Line Drive to LF Line); B. Campaneris Scores
- cWPA: 18.53%

#3. October 21, 1973 (WS Gm 7)
- Score: tied 0-0 (3rd inning, 1 out)
- Opponent: NYM
- Event: HR
- Play Description: Home Run (Deep RF); K. Holtzman Scores
- cWPA: 18.73%

#2. October 06, 1930 (WS Gm 5)
- Score: tied 0-0 (9th inning, 1 out)
- Opponent: STL
- Event: HR
- Play Description: Home Run (Deep LF); M. Cochrane Scores
- cWPA: 19.50%

#1. October 19, 1972 (WS Gm 4)
- Score: down 2-1 (9th inning, 1 out)
- Opponent: CIN
- Event: 1B
- Play Description: Single to CF (Fly Ball to CF-RF); A. Lewis Scores; G. Tenace to 3B
- cWPA: 19.98%