Bernard Tomic of Australia reacts against Damir Dzumhur of Bosnia and Herzegovina during his first round Men's Singles match on Day Two of the 2016 US Open. (Photo by Andy Lyons/Getty Images)

Australian superbrat Bernard Tomic has been fined $AUD13,300 for his outburst at a spectator during his first round loss in the US Open.

During his first round loss to world No.72 Samir Dzumnhur, Tomic was heard telling a spectator who was heckling him, “suck my balls, I will put my balls in your mouth”.

“You’re a peasant, I will give you some money to make you feel good,” Tomic added.

It is the second biggest fine at a grand slam this year, after England’s Heather Watson was fined with $AUS16,000 fine for jamming her racquet into Wimbledon’s grass courts during a second-round loss in May this year.