While the 1884 post-season championship series was the first such to be referred to as the "World's Series," Major League Baseball considers the 1903 World Series the first. Nonetheless, the 1884 series was baseball's first inter-league championship contest.
History
In 1884, Metropolitans manager Jim Mutrie issued a challenge to his NL counterpart, Frank Bancroft of the Grays. Mutrie's challenge was for a best-of-three series. Each team would put up a thousand dollars with the winner taking all.
This pre-modern-era World Series would feature a pitching match-up of future Hall of Famers and 300-game winners Charles "Old Hoss" Radbourn and Tim Keefe. That was the year Radbourn won his season-record 59 games (some sources say 60) for the Grays. Keefe was a "mere" 37–17. Playing under American Association rules, Radbourn and the Grays defeated the New York team in the first two games, 6–0 and 3–1.
Only the first game went the full nine innings; the others were called after seven and six, because of darkness and extreme cold, respectively. The third game arguably should never have been played as the format was best-of-three, and Providence clinched in two. It was played with the hope of generating further revenue.
The crowd for the third game comprised only 300 people due to bitter cold. The Grays did not want to play due to the weather but were given the option of choosing the umpire if they would play. The Grays accepted and strategically chose Keefe, the Mets best pitcher. Radbourn, pitching his third complete game in three days, led the Grays to a 12–2 rout. For the series, Radbourn allowed 11 hits and no earned runs in 22 innings.
Local newspaper The New York Clipper called the series "The Championship of the United States." Several newspapers such as The Sporting Life penned the Grays as "World Champions", and the new title stuck.
The total attendance for the three games was 3,800. Despite the low attendance, the two leagues continued the series, and attendance and prize money increased each of the next two years.
The World Series of 1884
Providence Grays (NL) (84–28) vs New York Metropolitans (AA) (75–32)
Edward. Achorn, Fifty-nine in '84: Barehanded Baseball and the Greatest Season a Pitcher Ever Had. New York: Smithsonian Books/Harper Collins, 2010.
Larry G. Bowman, Before the World Series: Pride, Profits and Baseball's First Championship. DeKalb, IL: Northern Illinois University Press, 2003.
Thomas Carson, "Baseball's First World Champions: The Providence Greys," reprinted in Ken LaZebnik and Steve Lehman (eds.), Base Paths: The Best of the Minneapolis Review of Baseball: Volume 1, 1981-1987. Dubuque, IA: William C. Brown, 1991.
Peter Mancuso, "October 23-25, 1884: The First 'World Series,'" in Bill Feiber (ed.), Inventing Baseball: The 100 Greatest Games of the 19th Century. Phoenix, AZ; Society for American Baseball Research, 2013.