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Learn about how Major League Baseball (MLB) playoffs work, from postseason wild-card play to the final out of the World Series. LiveAbout / Alex Dos Diaz The Major League Baseball (MLB) playoffs mark the end of the sport's game regular. Okay, so you may be an expert on today's biggest MLB players, but how much do you know about the pioneers of America's favorite pastime? Find out as you test your knowledge of the players who started it all with this fun MLB history quiz. H. Baseball is one of America's favorite pastimes. Baseball games are filled with anticipation as players line up to try and swing for the fences. Major League Baseball (MLB) players have to stay in great physical condition in order to play th.