O'Day will enter the Hall along with former Yankees owner Jacob Ruppert, who acquired Babe Ruth, and Deacon White, a 19th century star, July 28 in Cooperstown.
While he will be recognized on his plaque as a 30-year umpire, O'Day began in baseball as a pitcher, managed the Cubs in 1914 and later served as a scout. He was chosen to umpire the first modern World Series in 1903.
A 16-member panel of Hall of Famers, executives and media elected the three from an original list of 10.
His most famous moment, however, was during the infamous Merkle Boner game. He was the umpire that scored the Cubs their final pennant...
