Because no other league in the world is worth mentioning . Also, the nba is the oldest, and have called the nba champs world champs cause no other league was around outside the usa in the early years of the nba, so its like a tradition.
Because they're arrogant
The San Antonio Spurs won the 2007 NBA Champions!
NBA: The 2009 champs were the Los Angeles Lakers and the 2010 champs were also the Los Angeles Lakers. NFL: The 2009 champs were the New Orleans Saints and the 2010 season has not yet started. MLB: The 2009 champs were the New York Yankees and he 2010 season has not yet finished.
As of the 2012-2013 Seaon the Miami Heat are the World Champions after beating the San Antonio Spurs in a 7 Gmae Series.
You have to be serious.......Watched the news lately NBA champs?
2 more games
The Minneapolis Lakers won the 1952 NBA Finals four games to three over the New York Knicks.
Craig Macmilan hit 13 sixes In the Twenty20 World Champs