William Smith O'Brien (March 14, 1860 – May 26, 1911) was an American Major League Baseball player who played first base. He was considered a "one-year wonder" and led the National League (NL) in home runs in 1887.
بيلي أوبراين (بالإنجليزية: Billy O'Brien) هو لاعب كرة قاعدة أمريكي، ولد في 14 مارس 1860 في ألباني في الولايات المتحدة، وتوفي في 26 مايو 1911 في كانساس سيتي في الولايات المتحدة. (ar)
William Smith O'Brien (March 14, 1860 – May 26, 1911) was an American Major League Baseball player who played first base. He was considered a "one-year wonder" and led the National League (NL) in home runs in 1887. (en)