Founded in 1989
|Minor league affiliations|
|Major league affiliations|
|Minor league titles|
|League titles||1990, 2005, 2007, 2011|
Frederick Keys (1989-present)
|Ballpark||Harry Grove Stadium|
|Previous parks||McCurdy Field|
|Maryland Baseball Holding LLC|
|General manager||Dave Zidelis|
The Frederick Keys minor league baseball team is the "High-A" class A baseball affiliate of the Baltimore Orioles. The Keys are based in Frederick, Maryland. The franchise is named for Star Spangled Banner poet Francis Scott Key, a native of Frederick County. A new team mascot "Frank Key", short for Francis Scott Key, joined the current mascot, a coyote named Keyote, at the beginning of the 2011 baseball season. The team is currently owned by Maryland Baseball Holding LLC, after being purchased in 2006 from Comcast Spectacor. Home games are played at Harry Grove Stadium.
The team was founded in 1989 when the Baltimore Orioles decided to move their Class A affiliate from Hagerstown, Maryland. The city of Frederick convinced the owners of the then-Hagerstown Suns to move the team to Frederick and promised a 4,000-seat stadium to be built for the 1990 season. For the 1989 season, the Keys played at McCurdy Field, a Babe Ruth League stadium, while waiting for the construction of the new stadium to be completed. The Keys opened by losing both ends of a doubleheader (including a seven-inning perfect game by Dennis Burlingame) against the Durham Bulls. Their first win came on April 11, 1989 with a 3-1 victory over the Kinston Indians in the Keys' first-ever home game.
Only two players in Keys history have been transferred directly from Frederick to the Baltimore Orioles (excluding rehab related transfers). On September 3, 1996, Eugene Kingsale's contract was purchased by the Orioles. On June 11, 2005, Jeff Fiorentino's contract was purchased by the Orioles in order to replace the injured Luis Matos.
The Keys have played in the Carolina League Championship Series, the Mills Cup Series, four times, the first three against the Kinston Indians and the most recent against the Salem Avalanche, winning three Mills Cup championships. They won their first in 1990, and their second in the 2005 season, defeating Kinston both times. In 2005, they defeated Kinston three games to two at historic Grainger Stadium in the best of five series. They were swept by the Indians in 2006, 3 games to 0. They won the 2007 series against the Salem Avalanche.
Notable former Keys
Several Keys alumni have gone on to play in the major leagues. In their inaugural season, the opening day roster featured several future major leaguers: David Segui, Francisco de la Rosa, Luis Mercedes, Jack Voigt, and Pete Rose, Jr. 
Other Keys alumni include:
- Andy Van Slyke: 1995
- Arthur Rhodes: 1989, 1990
- Joe Borowski: 1989, 1990
- Sidney Ponson: 1996
- Brian Roberts Larry Bigbie Tim Raines, Jr.: 2000
- Eli Whiteside: 2002
- Nick Markakis: 2005
- Adam Loewen: 2005
- Nolan Reimold: 2006
- Matt Wieters: 2008
- Brad Bergesen: 2009
- Manny Machado: 2011
- Dylan Bundy: 2012
Frederick Keys roster
- Duggan, Paul (1989-01-12). "The Boys of Summers Past; Cherished Memories Resurface as Baseball Returns to Frederick" (PDF). The Washington Post. Retrieved 2007-01-07.
- "Perfect Game only Half of Keys' Troubles" (PDF). The Washington Post. 1989-04-10. pp. C7. Retrieved 2007-01-08.
- Eichelberger, Curtis (1989-04-12). "Keys Find 1st Victory in Home Opener, 3-1" (PDF). The Washington Post. pp. D4. Retrieved 2007-01-08.
- Goff, Steve (1989-04-07). "Keys, Cannons Ready to Play" (PDF). The Washington Post. pp. D7. Retrieved 2007-01-07.
|Norfolk Tides||Bowie Baysox
DSL Orioles 1
DSL Orioles 2