Nick Kyrgios cruised through to the second round of the 2018 Australian Open with a straight sets win over Rogerio Dutra Silva.
But it's hurt his back pocket, with the Aussie fined $3,765 for unsportsmanlike conduct.
Kyrgios was serving in the first set when a rowdy spectator yelled during his service motion.
He told the fan to "shut the f**k up bro", for which he copped a warning from the chair umpire.
The referee then warned the fans to ensure they stay quiet.
"Ladies and gentlemen, can I ask you not to call out during the server's motion? Thanks," he told them.
Kyrgios won comfortably against the Brazilian, defeating him 6-1, 6-2, 6-4.
The 17th seed will play Serbian Viktor Troicki on Wednesday night.