The Holland Series has been the annual championship series of the highest level of professional baseball in the Netherlands since 1987, concluding the postseason of Honkbal Hoofdklasse. It is played between the two winners of the playoffs.
The Holland Series championship is determined through a best-of-seven playoff.
Neptunus Rotterdam have played in 22 of the 28 Holland Series and have won 18 Holland Series championships, more than any other Hoofdklasse franchise.[1]