The 1884 St. Louis Maroons baseball team finished with a 94–19 record and won the championship of the new Union Association (UA). After the season, the UA folded and the Maroons joined the National League; they were the only UA team to continue past the 1884 season. The Maroons scored 887 runs while allowing 429, for a run differential of +458, the best in major-league history, as records and statistics of the UA are recognized by Major League Baseball (MLB).