Dallas Mavericks owner Mark Cuban just dropped the ultimate "IN YOUR FACE" statement to a minority owner of the team ... who tried to take control away from Mark last year.

Long story short -- the minority owner, a company owned by Ross Perot Jr. -- filed legal papers in May 2010 calling Cuban a "careless and reckless" owner who was running the team into the ground.

Perot begged a judge to remove Cuban from operational control of the squad before it was too late.

Now, Cuban has responded in legal docs with the greatest statement ever ... a photo of the Mavs hoisting the NBA championship trophy.

In the docs, Cuban adds, "Under Cuban's stewardship, the Mavericks have become one of the league's most successful teams and are now NBA champions."

He adds, "Accordingly, there can be no genuine question that [Perot's] claims of mismanagement lack merit and .... should be disposed of."