September 19, 1867|
|Died: February 20, 1954
New Castle, Delaware
|July 5, 1889, for the Philadelphia Athletics|
|Last MLB appearance|
|July 12, 1897, for the Brooklyn Bridegrooms|
|Earned run average||3.51|
John Joseph "Sadie" McMahon (September 19, 1867 – February 20, 1954) was a professional baseball player who played pitcher in the Major Leagues from 1889 to 1897. McMahon would play for the Philadelphia Athletics, Baltimore Orioles, and the Brooklyn Bridegrooms.
McMahon was born in Wilmington, Delaware and grew up in the Henry Clay Village area. In 1954, McMahon died and was buried in St. Joseph on the Brandywine Church Cemetery in Wilmington. He was inducted into the Delaware Sports Museum and Hall of Fame in 1979.
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