All is fair in competition,' Kyrie Irving said after waving middle fingers to Boston supporters.

Few players in the NBA elicit such a visceral – and vociferous – reaction from fans as Kyrie Irving.

The main news from Sunday's game, though, wasn't what Irving performed on the court, but how he handled heckling fans.

He gave the audience two middle fingers while standing on the sideline, and he generally justified his conduct after the game.

"It's nothing new what it's going to be like when I go into this place," Irving said after the game.

While standing near the sideline, he flashed double middle fingers to the fans, and he generally justified his conduct after the game.

Kyle Kuzma of the Washington Wizards was fined $15,000 by the NBA for throwing a spectator the middle finger earlier this season during a game.

Philadelphia centre Joel Embiid was fined by the NBA two seasons ago for slamming Atlanta's Kevin Huerter and profaning during an interview.