Mezue ahịrịokwu na-esonụ: Mgbe ihe fọrọ nke nta ka ọ bụrụ iri afọ abụọ nke egwuregwu baseball na-adịghị mma, ọdịmma nke ndị Pirates malitere ịgbanwe ná mmalite nke narị afọ nke 20. Ndị Pirates nwetara ọtụtụ ndị egwuregwu kpakpando site na Louisville Colonels, bụ ndị a na-atụ anya maka mkpochapụ mgbe N.L. kwenyere site na 12 ruo 8 ìgwè. (Ndị franchises ejikọtaghị ọnụ; nnweta ndị egwuregwu bụ azụmahịa dị iche iche.) Otu n'ime ndị egwuregwu ahụ bụ Honus Wagner, onye ga-aghọ otu n'ime ndị egwuregwu mbụ a họpụtara n'Ụlọ Egwuregwu Egwuregwu Baseball. Ndị Pirates so na ndị otu kachasị mma na baseball na mbido 1900s, na-emeri mmeri National League ugboro atọ n'usoro site na 1901 ruo 1903 ma sonye na
World Series nke oge a, nke Boston meriri ha. Ndị Pirates laghachiri na World Series na 1909, na-emeri Detroit Tigers maka aha ụwa mbụ ha. N'afọ ahụ, ndị Pirates si Exposition Park kwaga n'otu n'ime ogige bọọlụ mbụ e ji ígwè na simenti rụọ, Forbes Field.