© Anthony Gruppuso | 5 Sep 2012
UNDATED (CNN) -- Cowboys fans have two things to celebrate today: Their team upset the New York Giants in last night's NFL season opener. And the 'Boys from Dallas are the most-valuable sports team in the United States.
Forbes says it values the Cowboys at more than $2.1 billion. That's more than any other franchise in the world except English soccer club Manchester United.
Forbes attributes the Cowboys' worth to successful marketing and the team's stadium in Arlington, Texas.
The team is also a top seller of fan merchandise, like jerseys and caps.
Rounding out the top three NFL teams on Forbes' list are the New England Patriots and the Washington Redskins, both worth about $1.6 billion.
The least-valued franchise is the Jacksonville Jaguars, at $770 million.