Donn Alvin Clendenon was an American professional baseball player. He played in Major League Baseball as a first baseman from 1961 to 1972. He is most notable for his performance during the 1969 World Series when he won the World Series Most Valuable Player Award by hitting three home runs to help lead the team known as the Miracle Mets to an upset victory over the Baltimore Orioles.

The 1969 World Series was the championship series of Major League Baseball's (MLB) 1969 season. The 66th edition of the World Series, it was a best-of-seven playoff between the American League (AL) champion Baltimore Orioles and the National League (NL) champion New York Mets. The Mets won the series, four games to one, to accomplish one of the greatest upsets in Series history, as that particular Orioles team was considered to be one of the finest ever. The World Series win earned the team the sobriquet "The Miracle Mets". This was the first World Series of MLB's divisional era.