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Roy Halladay's perfect game - Wikipedia
Why do errors count against a perfect game if they're not the pitcher's fault? - Quora
What a Week! Including Baseball's 24th Perfect Game!
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What is a perfect game in baseball? Explaining the rare accomplishment in the grand old game
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Why has it been so long since an MLB pitcher has thrown a perfect game? - Quora
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Toughest pitcher on me was Roy Halladay - Derek Jeter answers fans' questions, proclaims Philadelphia Phillies ace the toughest pitcher he faced
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Roy Halladay Pitches Baseball's 20th Perfect Game - The New York Times
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Remembering Roy Halladay's perfect game and playoff-no hitter
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Roy Halladay throws perfect game : r/videos
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Aaron Nola - Wikipedia
Will there ever be a perfect game in baseball in which the pitcher only throws strikes? - Quora
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Phil Humber threw perfect game for White Sox
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Cole Hamels - Wikiwand
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Roy Halladay No-Hitter: 10 Greatest Pitching Performances in MLB Playoff History, News, Scores, Highlights, Stats, and Rumors
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Philadelphia Phillies - Wikipedia