So it was a complete surprise last month when, with no warning, the families that control the Las Vegas Sands casino empire announced that they had reached a binding agreement to buy a controlling interest in the National Basketball Association's Dallas Mavericks from Mark Cuban.
The reliably loquacious Mr. Cuban, who always seemed to be having more fun than any other owner, declined to speak on the record for this article. The Adelson and Dumont families, wary of getting ahead of an N.B.A. approval process that includes due diligence and a vote on the sale by other team owners, declined to comment beyond a statement expressing their excitement.
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