Dallas Basketball owns and operates the Dallas Mavericks professional basketball franchise, which joined the National Basketball Association in 1980. Dallas struggled to find success for much of its history but has become a regular contender for the playoffs under current owner Mark Cuban. A talented roster that included such players as Dirk Nowitzki and Josh Howard earned the franchise's first trip to the NBA Finals in 2006 (which resulted in a loss to the Miami Heat). The Dallas basketball team was formed by millionaire Donald Carter; Cuban, an Internet billionaire, has controlled the Mavs since 2000.

Dallas Cowboys Football Club operates the famed Dallas Cowboys professional football franchise, one of the most popular teams in the National Football League and the winner of five Super Bowl titles (a mark it shares with the San Francisco 49ers). Dallas has been home to such Hall of Fame players as Troy Aikman, Michael Irvin, and Roger Staubach, as well as famed head coach Tom Landry. The team was founded in 1960 by Clint Murchison Jr. and Bedford Wynne. Oilman Jerry Jones has owned the team since 1989.

The Dallas Stars professional hockey team represents the Big D in the National Hockey League, boasting one Stanley Cup championship in 1999. Dallas joined the ranks of the NHL in 1993 when then-owner Norm Green moved the team formerly known as the North Stars from Minnesota. Texas billionaire Tom Hicks has owned the Stars since 1995 and operates the team through his Hicks Sports Group (which also owns the Texas Rangers baseball team). Hicks is also a partner with Dallas Mavericks owner Mark Cuban in Center Operating Company, which owns and operates Dallas' American Airlines Center.

The Denver Nuggets professional basketball franchise was formed by trucking magnate J. W. "Bill" Ringsby in 1967 as the Denver Rockets (renamed in 1974), a charter member of the American Basketball Association. Since joining the National Basketball Association in 1976, the team has had little postseason success, although the signing of star forward Carmelo Anthony in 2004 has helped spur fan interest, giving a boost to attendance at the team's Pepsi Center arena. St. Louis Rams owner Stan Kroenke will relinquish ownership to his son Josh Kroenke in 2010.

Derby County Football Club is a professional football team that competes in the UK's Football League Championship. Better known to supporters as The Rams, Derby County F.C. was founded in 1884 and plays host at Pride Park Stadium. The football club is owned by an investment group led by US-based sports consulting firm General Sports & Entertainment.

The Detroit Lions is one of the older franchises in the National Football League, being founded in 1930 as the Portsmouth (Ohio) Spartans. The team moved to Detroit and changed its name in 1934 and went on to win four championship titles, its last in 1957. More recently, however, Detroit fans have been disappointed most seasons by losing records and failed attempts to reach the post-season. The team plays host at Detroit's Ford Field. William Clay Ford Sr., descendant of automobile pioneer Henry Ford, has controlled the Lions since 1964.

Detroit Pistons Basketball Company owns and operates the Detroit Pistons professional basketball team, which boasts three National Basketball Association championships, its last coming in 2004. The team was formed in 1941 as the Fort Wayne (Indiana) Zollner Pistons by auto piston maker Fred Zollner, who moved the team to Detroit in 1957. The Pistons roster has included such stars as Joe Dumars, Bill Laimbeer, and Isiah Thomas. Karen Davidson, widow of the late William Davidson, controls the team. The family also owns Palace Sports & Entertainment, a holding company that owns Detroit's Palace of Auburn Hills arena.

The Detroit Red Wings are flying high in the National Hockey League. Founded in 1926, the team is one of the most successful franchises in NHL history with 11 Stanley Cup championships (the last in 2008). Detroit has been a perennial playoff contender for more than a decade and regularly draws packed houses at Joe Louis Arena. Its roster has boasted such Hall of Fame players as Jack Adams, Gordie Howe, Terry Sawchuk, and "Black" Jack Stewart. Mike and Marian Ilitch bought the team in 1982 and run the franchise through their holding company, Ilitch Holdings. The Ilitch family also owns the Detroit Tigers and pizza chain Little Caesar.

Dolphins Enterprises owns and operates the Miami Dolphins professional football team, which has won two Super Bowl championships (its last coming at the end of the 1973 season) and lays claim to the only undefeated season by a National Football League team (in 1972). The franchise has not lacked for opportunities, with five conference titles and numerous playoff appearances. Its roster has included such Hall of Fame players as Larry Csonka, Bob Griese, and Dan Marino. The franchise was founded in 1965 by lawyer Joe Robbie as a member of the American Football Legaue. It joined the NFL ranks when the two leagues merged in 1970. Billionaire Stephen Ross acquired control of the team from Wayne Huizenga in 2009.

Dover Motorsports is a leading operator of racetracks that host more than a dozen top auto racing events each year. Its tracks include Gateway International Raceway near St. Louis, Memphis Motorsports Park, Nashville Superspeedway, and its flagship Dover International Speedway in Delaware. The tracks hold events sponsored by all the major US racing leagues, including NASCAR, the Indy Racing League, and the National Hot Rod Association, though stock car racing accounts for 70% of sales. Chairman Henry Tippie controls more than 50% of the company as executor of the estate of the late chairman John Rollins.

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