Yes, they have today on Sunday, June 12, 2011 (they beat Miami Heat).
The Mavericks Won The NBA Championship In 2011 Above THe Miami Heat
The Dallas Mavericks, led by Dirk Nowitzki won the 2011 NBA Championship, beating the Miami Heat 4-2
The mavericks won the championship in 2011
The Dallas Mavericks won the championship and Miami Heat was in 2nd place.
The 2011 National Basketball Association Champions were the western conference Dallas Mavericks. The Mavericks played against the eastern conference Miami Heat. The championship that the Dallas Mavericks won was the first ever NBA Championship for the team.
They have just won their first championship.
The Dallas Mavericks won the 2011 NBA Championship
One. The Mavericks won the 2011 NBA championship, defeating the Miami Heat four games to two.