Pitching against the Philadelphia Athletics at the Huntington Avenue Grounds, Cy Young of the Boston Americans throws the first perfect game in the modern era of baseball.

Denton True "Cy" Young (March 29, 1867 November 4, 1955) was an American Major League Baseball (MLB) pitcher. Born in Gilmore, Ohio, he worked on his family's farm as a youth before starting his professional baseball career. Young entered the major leagues in 1890 with the National League's Cleveland Spiders and pitched for them until 1898. He was then transferred to the St. Louis Cardinals franchise. In 1901, Young jumped to the American League and played for the Boston Red Sox franchise until 1908, helping them win the 1903 World Series. He finished his career with the Cleveland Naps and Boston Rustlers, retiring in 1911.

Young was one of the hardest-throwing pitchers in the game early in his career. After his speed diminished, he relied more on his control and remained effective into his forties. By the time Young retired, he had established numerous pitching records, some of which have stood for over a century. He holds MLB records for the most career wins, with 511, along with most career losses, innings pitched, games started, and complete games. He led his league in wins during five seasons and pitched three no-hitters, including a perfect game in 1904.

Young was elected to the National Baseball Hall of Fame in 1937. In 1956, one year after his death, the Cy Young Award was created to honor the best pitcher in each league for each season.

In baseball, the pitcher is the player who pitches the baseball from the pitcher's mound toward the catcher to begin each play, with the goal of retiring a batter, who attempts to either make contact with the pitched ball or draw a walk. In the numbering system used to record defensive plays, the pitcher is assigned the number 1. The pitcher is often considered the most important player on the defensive side of the game, and as such is situated at the right end of the defensive spectrum. There are many different types of pitchers, such as the starting pitcher, relief pitcher, middle reliever, lefty specialist, setup man, and the closer.

Traditionally, the pitcher also bats. Starting in 1973 with the American League and spreading to further leagues throughout the 1980s and 1990s, the hitting duties of the pitcher have generally been given over to the position of designated hitter, a cause of some controversy. The Japanese Central League has not adopted the designated hitter position.