Perfect game (baseball) - Wikipedia
https://en.wikipedia.org/wiki/Perfect_game_(baseball)
A perfect game in Major League Baseball is a game in which a pitcher pitches a victory that lasts a minimum of nine innings and no opposing batter reaches base. To achieve a perfect game, a team must not allow any opposing player to reach base by any means, including hits, walks, hit batsmen, uncaught third strikes, catcher's or fielder's interference, or fielding errors; in short, "27 up, 27 down". The feat has been achieved 23 times in MLB history – 21 times since the modern era began in ...
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