The 1890 Brooklyn Bridegrooms left the American Association and joined the National League. They won the league championship, becoming one of a select few teams to win championships in different leagues in back-to-back seasons.

Regular season

Season standings

Record vs. opponents

Roster

Player stats

Batting

Starters by position

''Note: Pos = Position; G = Games played; AB = At bats; R = Runs scored; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in; SB = Stolen bases''

Other batters

''Note: G = Games played; AB = At bats; R = Runs scored; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in; SB = Stolen bases''

Pitching

Starting pitchers

Note: G = Games pitched; GS = Games started; CG = Complete games; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; BB = Bases on balls; SO = Strikeouts

Other pitchers

Note: G = Games pitched; GS = Games started; CG = Complete games; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; BB = Bases on balls; SO = Strikeouts

1890 World Series

In the 1890 World Series, the Bridegrooms faced the American Association Champions, the Louisville Colonels. The Series ended in a 3–3–1 tie.