The 1971 World Series was the championship round of Major League Baseball's (MLB) 1971 season and featured the first night game in its history. The 68th edition of the Fall Classic was a best-of-seven playoff between the defending World Series and American League (AL) champion Baltimore Orioles and the National League (NL) champion Pittsburgh Pirates. The Pirates overcame a two-games-to-none series deficit to defeat the Orioles in seven games, in large part because of superstar right fielder Roberto Clemente, whose all-around brilliance was on full display on a national stage. Game 4 in Pittsburgh was the first World Series game played at night.