The team won the National League pennant with a record of 101–47, 8 games ahead of the Boston Beaneaters, after finishing tenth in 1898.
The 1899 season began with the Brooklyn team and the Baltimore Orioles merging their ownership groups.
On March 11, the team brought Bill Dahlen, Mike Heydon, Jay Hughes, Hughie Jennings, Willie Keeler, Joe Kelley, Al Maul, Dan McGann and Doc McJames onto their roster from Baltimore, while assigning Harry Howell, Candy LaChance, Kit McKenna, Ralph Miller, Jack Ryan, Jimmy Sheckard and Aleck Smith to the Orioles.
Infielders Note: Pos = Position; G = Games played; AB = At bats; R = Runs; H = Hits; Avg.
= Batting average; HR = Home runs; RBI = Runs batted in; SB = Stolen bases 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 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 Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned run average; BB = Bases on balls; SO = Strikeouts