Eugene Anthony Clines was an American professional baseball player and coach. He played in Major League Baseball (MLB) as an outfielder from 1970 to 1979, most prominently as a member of the Pittsburgh Pirates teams that won four National League Eastern Division titles in five seasons between 1970 and 1974, and won the World Series in 1971. He also played for the New York Mets, Texas Rangers, and Chicago Cubs. He batted and threw right-handed.

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 won the World Series 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.