After the 1889 season, Gore's teammate, John Montgomery Ward, had organized a new league, the Players' League, and many players were a part of his new union of baseball players called "The Brotherhood". The Players' League began play for the 1890 season, and Gore joined many of his fellow Giants as they joined the new league to play for the New York Giants. Again, Gore split his playing time between left and center field with both Slattery and O'Rourke, but did finish the season appearing in 93 of the team's 132 games, and batted .318 with 132 runs.