Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. John J. Fitzgerald (1866 December 20, 1892), also known as Warren B. Fitzgerald, was an American Major League Baseball player who pitched one season in the Majors with the 1890 Rochester Broncos. He pitched in a total of 11 games, started all of them, and completed eight. He struck out 35 batters in 78 innings pitched. Major League Baseball (MLB) is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League. The two leagues merged in 2000 into a single MLB organization led by the Commissioner of Baseball after 100 years as separate legal entities.