Josh Giddey in the middle of huge NBA brawl sparked by former MVP Giannis Antetokounmpo

Australian NBA star Josh Giddey has found himself in the middle of an all-in NBA scuffle, following Chicago's loss to Milwaukee on Sunday AEDT.

The Bulls were down 110-103 as the final seconds ticked off the clock in the game, but Bucks star Giannis Antetokounmpo had the ball in his hands and had one more play left in him.

Instead of just dribbling out the clock with the result certain, which is the unwritten rule of the NBA, he took the ball down to the other end of the court and windmill dunked.

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The Bulls quickly inbound the ball to Giddey with a second left on the clock, and he attempted a half court heave with no luck, as the local crowd booed the star's move.

Chicago veteran Nikola Vucevic took exception to Antetokounmpo's last second dunk, getting in his face.

The 'Greek Freak' did not appear too apologetic for his breaking of the unwritten rule as the two went face to face, leading to teammates pouring in from all directions.

Bulls guard Coby White went right to Antetokounmpo, before being pulled back by a Bucks player who came off the bench wearing a black hoodie with the hood up, with the two quickly exchanging shoves as Milwaukee guard Ryan Rollins jumped in to grab White by the jersey.

This is where Giddey got amongst it, pulling Rollins back before the two went at it, exchanging shoves and words.

The Aussie then ended up towards the back of the skirmish as things calmed down following intervention from coaches and referees.

Percentage isn't a factor in the NBA's standings, meaning there is no need to run up the score on an opponent. Any win is worth the same, regardless of the margin.

Generally, once there's under 24 seconds left in a game and the shot clock is off, teams dribble out the clock without attempting to score again.

As Antetokounmpo showed, doing so tends to lead to some immediate animosity, particularly a dunk in someone else's gym.

It was the former NBA MVP's first game back from a calf injury. He scored 29 and grabbed eight rebounds in the win.

The victory also broke a run of five straight wins for Chicago, ending their hot streak.

Giddey finished with 13 points, nine assists and seven rebounds in the loss, while Vucevic and White top-scored with 16 apiece.

They sit ninth and 11th in the Eastern Conference respectively, after mediocre starts to the NBA season.

It was the second NBA scuffle to break out on Sunday, following a much more aggressive fight between Phoenix centre Mark Williams and New Orleans guard Jose Alvarado.