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Tim Kurkjian's Baseball Fix - Harvey Haddix pitched 12 perfect innings and lost - ESPN
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May 26, 1959: Harvey Haddix pitches 12 perfect innings, loses in 13th – Society for American Baseball Research
Who Were the Best MLB Pitchers of the Decade?, News, Scores, Highlights, Stats, and Rumors
Rasmussen takes perfecto to 9th, 08/14/2022
Perfect games lost in the 9th inning
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Throwing a 10-inning Perfect Game and Losing : r/MLBTheShow
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Perfect games broken up in ninth inning