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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 Cincinnati Reds 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 22, 1975 (WS Gm 7)
- Score: down 3-0 (6th inning, 2 outs)
- Opponent: BOS
- Event: HR
- Play Description: Home Run (Fly Ball to Deep LF); J. Bench Scores
- cWPA: 16.01%

#9. October 21, 1975 (WS Gm 6)
- Score: tied 6-6 (9th inning, 0 outs)
- Opponent: BOS
- Event: Out
- Play Description: Double Play: Foul Popfly: LF (LF into Foul Terr.); D. Doyle out at Hm/LF-C; C. Yastrzemski to 3B
- cWPA: 16.02%

#8. October 21, 1975 (WS Gm 6)
- Score: tied 3-3 (7th inning, 2 outs)
- Opponent: BOS
- Event: 2B
- Play Description: Double to CF (Fly Ball); K. Griffey Scores; J. Morgan Scores
- cWPA: 16.30%

#7. October 11, 1972 (NLCS Gm 5)
- Score: tied 3-3 (9th inning, 2 outs)
- Opponent: PIT
- Event: WP
- Play Description: *WALK-OFF*:Wild Pitch; G. Foster Scores
- cWPA: 18.76%

#6. October 08, 1940 (WS Gm 7)
- Score: down 1-0 (7th inning, 0 outs)
- Opponent: DET
- Event: 2B
- Play Description: Double to RF; F. McCormick Scores
- cWPA: 20.60%

#5. October 19, 1972 (WS Gm 4)
- Score: down 1-0 (8th inning, 2 outs)
- Opponent: OAK
- Event: 2B
- Play Description: Double to RF (Fly Ball to RF Line); D. Concepción Scores; J. Morgan Scores
- cWPA: 21.48%

#4. October 22, 1975 (WS Gm 7)
- Score: down 3-2 (7th inning, 2 outs)
- Opponent: BOS
- Event: 1B
- Play Description: Single to CF (Line Drive); K. Griffey Scores; E. Armbrister to 3B; P. Rose to 2B (Advanced on throw) on throw to Hm
- cWPA: 21.61%

#3. October 11, 1972 (NLCS Gm 5)
- Score: down 3-2 (9th inning, 0 outs)
- Opponent: PIT
- Event: HR
- Play Description: Home Run (Fly Ball to Deep RF)
- cWPA: 22.52%

#2. October 22, 1972 (WS Gm 7)
- Score: down 3-1 (8th inning, 0 outs)
- Opponent: OAK
- Event: 2B
- Play Description: Double to RF (Line Drive to 2B-1B); P. Rose to 3B
- cWPA: 22.90%

#1. October 22, 1975 (WS Gm 7)
- Score: tied 3-3 (9th inning, 2 outs)
- Opponent: BOS
- Event: 1B
- Play Description: Single to CF (Fly Ball to Short CF); K. Griffey Scores; P. Rose to 3B; J. Morgan to 2B (Advanced on throw) on throw to 3B
- cWPA: 33.84%