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A '''perfect game''' is a game in which a pitcher (or combination of pitchers) throws a full nine-inning game without allowing a single opposing batter on base. This differs from a no-hitter, in that the pitcher(s) may not allow any walks or hit batsmen. By definition, a perfect game will also be a [[shutout]], meaning a game where the opposing team scores no runs.

A '''perfect game''' is a game in which a pitcher (or combination of pitchers) throws a full nine-inning game without allowing a single opposing batter on base. This differs from a no-hitter, in that the pitcher(s) may not allow any walks or hit batsmen. By definition, a perfect game will also be a [[shutout]], meaning a game where the opposing team scores no runs.

There have been just 19 perfect games in Major League Baseball history <ref>[http://www.mlb.com/mlb/history/rare_feats/index.jsp?feature=perfect_game Major League Baseball; Rare feats]</ref> and only one of those occurred in the postseason. The first perfect game was thrown on June 12, 1880, by Lee Richmond of the Worcester Ruby Legs in a 1-0 defeat of the Cleveland Blues.<ref>[http://www.baseball-almanac.com/boxscore/06121880.shtml Baseball almanac]</ref>  The most recent such game was thrown by Dallas Braden of the Oakland Athletics, who blanked the Tampa Bay Rays on May 9, 2010.

There have been just 19 perfect games in Major League Baseball history <ref>[http://www.mlb.com/mlb/history/rare_feats/index.jsp?feature=perfect_game Major League Baseball; Rare feats]</ref> and only one of those occurred in the postseason. The first perfect game was thrown on June 12, 1880, by Lee Richmond of the Worcester Ruby Legs in a 1-0 defeat of the Cleveland Blues.<ref>[http://www.baseball-almanac.com/boxscore/06121880.shtml Baseball almanac]</ref>  The most recent such game was thrown by Roy Halladay of the [[Philadelphia Phillies]], who blanked the [[Florida Marlins]] on May 29, 2010.