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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 Washington Nationals 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 10, 1924 (WS Gm 7)
- Score: tied 3-3 (10th inning, 1 out)
- Opponent: SFG
- Event: Out
- Play Description: Ground Ball Double Play: P-SS-1B
- cWPA: 14.59%

#9. October 04, 1924 (WS Gm 1)
- Score: down 2-1 (9th inning, 1 out)
- Opponent: SFG
- Event: 2B
- Play Description: Double to LF (Line Drive to Deep LF-CF); O. Bluege Scores
- cWPA: 15.14%

#8. October 10, 1924 (WS Gm 7)
- Score: tied 3-3 (9th inning, 2 outs)
- Opponent: SFG
- Event: Out
- Play Description: Groundout: 3B-1B
- cWPA: 15.22%

#7. October 15, 1925 (WS Gm 7)
- Score: ahead 4-3 (4th inning, 2 outs)
- Opponent: PIT
- Event: 2B
- Play Description: Double to CF (Line Drive to Short CF-RF); S. Rice Scores; G. Goslin Scores
- cWPA: 16.25%

#6. October 10, 1924 (WS Gm 7)
- Score: tied 3-3 (9th inning, 1 out)
- Opponent: SFG
- Event: SO
- Play Description: Strikeout Swinging
- cWPA: 18.33%

#5. October 10, 1924 (WS Gm 7)
- Score: tied 3-3 (9th inning, 1 out)
- Opponent: SFG
- Event: FC
- Play Description: Fielder's Choice 1B; J. Judge to 3B/Safe on E6 (catch); O. Bluege to 1B
- cWPA: 18.58%

#4. October 15, 1925 (WS Gm 7)
- Score: tied 6-6 (8th inning, 1 out)
- Opponent: PIT
- Event: HR
- Play Description: Home Run (Fly Ball to Deep LF)
- cWPA: 24.55%

#3. October 10, 1924 (WS Gm 7)
- Score: tied 3-3 (12th inning, 1 out)
- Opponent: SFG
- Event: 2B
- Play Description: *WALK-OFF*:Double to LF (Ground Ball); M. Ruel Scores (Unearned run); W. Johnson to 3B
- cWPA: 28.47%

#2. October 30, 2019 (WS Gm 7)
- Score: down 2-1 (7th inning, 1 out)
- Opponent: HOU
- Event: HR
- Play Description: Home Run (Fly Ball); J. Soto Scores
- cWPA: 32.90%

#1. October 10, 1924 (WS Gm 7)
- Score: down 3-1 (8th inning, 2 outs)
- Opponent: SFG
- Event: 1B
- Play Description: Single to LF (Ground Ball); N. Leibold Scores; M. Ruel Scores; M. Shirley to 2B
- cWPA: 35.20%