April 25, 1876, the Chicago White Stockings when their opening game in the inaugural season of the National League. They beat the Louisville Grays 4-
0 in .
The White Stockings would change their name first to the Colts, Orphans, and
now known as the Chicago Cubs. They would win the National League championship
in the first year of the the league. Louisville
The White Stockings would finish the season at 52-14, and would dominate the National League by winning six of the first eleven titles. They would be called the Cubs in 1902 by the Chicago Daily News, but the team name wasn't officially changed until 1907.
The 1876 Chicago White Stockings roster can be found at: http://www.baseball-almanac.com/teamstats/roster.php?y=1876&t=CH6
The 1876 Chicago White Stockings schedule with results: http://www.baseball-almanac.com/teamstats/schedule.php?y=1876&t=CH6