I'm sure it's 1, but I can't think of any particular instances of that.
One strange instance that sticks out in my mind was during the 2011 World Series, when Tony LaRussa made a pitching change and called Lance Lynn in from the bullpen. Lynn faced one batter, intentionally walked him, and then another pitching change was made.
If you're talking about complete games by starting pitchers, Charley "Red" Barrett of the Boston Braves only needed 58 pitches to go all 9 innings on August 10, 1944.
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yes there has in usa Baseball a pitchter in a high school game in Ohio he's name is r.l eisenboch i don't know if its spelled right thought
Not in MLB or the minor leagues. But there has been one pitcher that struckout 27 batters in a game. That was Ron Necciai who was pitching for the Bristol Twins of the Appalachian League in 1952. He was credited with 27 strikeouts in a 7-0 no-hitter he pitched against the Welch Miners. He did give up a walk and hit a batter in the game. Another batter reached base on a passed ball on a third strike. Necciai wound up striking out the next batter to record four strikeouts in an inning. The only two batters that hit the ball grounded out to the first baseman and reached base on an error.
In the history of Baseball, as of the 2012 Major League Baseball (MLB) season, 21 perfect games ("27 up, 27 down") have been thrown - 19 of which have been thrown in the Modern Era. Of these 21 perfect games thrown, none has been pitched with only 27 pitches being thrown. On record, the fewest pitches thrown in a perfect game was 74 pitches thrown by Addie Joss of the Cleveland Naps against the Chicago White Sox on October 2, 1908.