The Colorado Rockies are a professional baseball team based in Denver, Colorado. They compete in Major League Baseball (MLB) as a member club of the National League (NL) West division. The team began play in 1993 as an expansion team and played their home games for their first two seasons at Mile High Stadium. Since 1995, they have played at Coors Field, which is located in the Lower Downtown area of Denver. The Rockies have reached the MLB postseason four times, each time as the National League wild card team. Twice (1995 and 2009) they were eliminated in the first round of the playoffs. In 2007, the Rockies advanced all the way to the World Series, only to be swept by the Boston Red Sox. The team is owned by the Monfort brothers and managed by Bud Black. The Rockies are still best known for their high-scoring home games, which are largely a result of the thin air at Denver's high elevation and the effects of the dry climate on the balls' leather covering.