After Boban Marjanovic signed with the Dallas Mavericks, Rachel Nichols was sad because Boban and Tobias Harris won't be teammates anymore. (0:41)

Nichols sad to see the Bobi and Tobi show canceled (0:41)

The NBA fined Dallas Mavericks owner Mark Cuban $50,000 after he admitted to leaking information from last week's Board of Governors meeting to a reporter, sources told ESPN.

The fine was not publicly announced, but the league office issued a memo to inform teams.

"I appreciate the irony of your reporting on a fine that someone should -- but won't -- get fined for leaking to you," Cuban told ESPN.

Sources said Sacramento Kings owner Vivek Ranadive expressed concern that information about the vote to allow coaches' challenges was being reported while the meeting was still in session. Cuban immediately admitted that he leaked the information, sources said.

Cuban was fined because it is a violation of league rules to talk to outsiders about Board of Governors business.