Miguel Ángel Cuellar Santana was a Cuban professional baseball player. He played for 15 seasons in Major League Baseball as a left-handed pitcher in 1959 and from 1964 through 1977, most prominently as a member of the Baltimore Orioles who won the American League (AL) pennant in each of Cuellar's first three seasons with the team. During that time, Cuellar and the Orioles won the 1970 World Series. Cuellar also played for the Cincinnati Reds, St. Louis Cardinals, Houston Astros and California Angels.

The Baltimore Orioles are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member of the American League (AL) East Division. As one of the American League's eight charter teams in 1901, the franchise spent its first year as a major league club in Milwaukee as the Milwaukee Brewers before moving to St. Louis to become the St. Louis Browns in 1902. After 52 years in St. Louis, the franchise was purchased in 1953 by a syndicate of Baltimore business and civic interests, led by attorney and civic activist Clarence Miles and Mayor Thomas D'Alesandro Jr. The team's current owner is David Rubenstein. The Orioles' home ballpark is Oriole Park at Camden Yards, which opened in 1992 in downtown Baltimore. The oriole is the official state bird of Maryland; the name has been used by several baseball clubs in the city, including another AL charter member franchise which moved to New York in 1903 and became the Yankees. Nicknames for the team include the "O's" and the "Birds".