Left-handed pitcher Rube Marquard of the Giants won 19 decisions in a row to start the 1912 season. This tied a single-season mark set by Tim Keefe in 1888 and remains a record that stands to this day. Marquard’s first loss of the season came on July 8th, when the Cubs defeated New York, 7-2. Marquard went on to win a total of 26 decisions for the season, helping the Giants on their way to winning the NL pennant.
It’s funny how you remember strange things when someone posts something like this post. I recalled that Carl Hubbell had done something similar, so I looked it up. In 1936 he won his last 16 in a row, then won the first 8 the next year for a total of 24 wins without a loss (but over 2 seasons). Never been a fan of the Giants, but they do get good pitching sometimes.
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24 consecutive wins is crazy. How heartbreaking that must have been when the streak ended!