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Five innings
12 innings in Game 7 of the 1924 World Series between the Washington Senators and New York Giants played in Washington ... the Senators won 4-3.
As of the 2008 World Series: 1) Jack Billingham - 0.36 - 25 1/3 innings pitched in the 1972, 1975, and 1976 World Series.2) Harry Breechen - 0.83 - 32 2/3 innings pitched in the 1943, 1944, and 1946 World Series.3) Babe Ruth - 0.87 - 31 innings pitched in the 1916 and 1918 World Series.4) Sherry Smith - 0.89 - 30 1/3 innings pitched in the 1916 and 1920 World Series.5) Sandy Koufax - 0.95 - 57 innings pitched in the 1959, 1963, 1965, and 1966 World Series.6) Christy Mathewson - 0.97 - 101 2/3 innings pitched in the 1905, 1911, 1912, and 1913 World Series. Useless bit of trivia: According to Baseball Reference, Jack Billingham and Christy Mathewson are cousins.
The record for the longest World Series game in terms of innings is 14 innings, which has occurred several times. The most recent was Game 3 of the 2018 World Series between the Los Angeles Dodgers and the Boston Red Sox.
In 1904 and 1994 the baseball world series were not played.
Baseball
The first World Series was played in 1903.
Jim 'Catfish' Hunter with 13 innings pitched.
Through the 2008 World Series ... In a single World Series the record is 27 by Christy Mathewson of the New York Giants in 1905. He threw three complete game shutouts in helping the Giants defeat the Philadelphia Athletics, 4 games to 1. Over more than one World Series the record is 33 2/3 innings by Whitey Ford of the New York Yankees. The streak started in the first inning of Game 1 of the 1960 World Series ... Ford threw shutouts Game 1 and Game 5. It continued in the 1961 World Series as he threw a shutout in Game 1 and 5 scoreless innings in Game 4 to extend the streak to 32 innings. It ended in Game 1 of the 1962 Series with two outs in the second inning.
to determine the rightful champions of baseball
Yes
Tom seaver