Marco Belinelli hit a dagger 3 in Game 7 against the Nets and showed off his big marbles. 

And now he's got to give up some big dollars. 

The league announced Monday that Belinelli has been fined $15,000 for doing the Sam Cassell "dance" after hitting a 3 late in the fourth quarter of Game 7. 

There is a precedent for fining players for the move. Both Eddie House and Josh Smith were fined in 2011 for it.