New York Mets, American professional baseball team based in Flushing, Queens, New York. The Mets have won two World Series championships (1969 and 1986) and five National League (NL) pennants. The Mets trace their roots to the proposed Continental League, whose formation was announced in 1959 by New York attorney Bill Shea; a New York-based team was to be a charter member of the league. The league was abandoned in 1960 when it was promised two teams each in the American and National Leagues as part of professional baseball’s expansion. The organization was formed in 1961, and the name Mets