One. The Mavericks won the 2011 NBA championship, defeating the Miami Heat four games to two.
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Miami Heat to Dallas Mavericks 4-2
Boston celtics
Dallas Mavericks
They won their first championship against the Miami HEAT in the 2011 NBA championship.
Shaq played for Miami heat for 5 years and help them win a championship in 2006 vs. The Dallas mavericks