Christopher Steven Tillman is an American former professional baseball pitcher. He made his Major League Baseball (MLB) debut with the Baltimore Orioles in 2009, and played with them until 2018. He was named an All-Star in 2013.

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".