CHARLOTTE, N.C.—Mark Cuban yelled and cheered from his courtside seat during the game, then high-fived his players after it was over.

The boisterous Dallas Mavericks owner didn’t act any differently a day after being charged with insider trading. His team, meanwhile, stopped looking like the dysfunctional unit that started the season.

Dirk Nowitzki scored 32 points, outscoring Charlotte’s entire starting five, and the Mavericks never trailed in a 100-83 rout on Tuesday night for their second straight win, overcoming any distractions their owner might have presented by t...

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