MLB history: What team has had the most perfect games thrown against it?
20 years later, David Wells' perfect game seems even more impossible
Matt Cain's perfect game - Wikipedia
List of Chicago White Sox no-hitters - Wikipedia
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Yankees pitcher Domingo Germán throws perfect game against Oakland
Perfect game (baseball) - Wikipedia
Modeling Perfect Games and No-Hitters in Baseball – Society for American Baseball Research
A look at all 24 perfect games in AL/NL history
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Today in Oakland A's history (5/9): Dallas Braden throws perfect game - Athletics Nation
On 10th anniversary of Felix Hernandez's perfect game, Mariners reflect on difficulty of accomplishment
No-hitter - Wikipedia
All-time perfect games
Best 60-game performances in MLB history
