Nick Kyrgios faces sanctioning after making an explosive exit from the ATP Masters 1000 event in Miami, then claiming he was a "little bored" so he started mimicking Roger Federer's serve.
In a typically lively and controversial performance, Kyrgios destroyed two racquets, gave one to a fellow Boston Celtics fan and clashed with the umpire after being docked a point for telling a spectator "f*** you man".
The combustible Canberran also produced the shot of the tournament, only to crash out 4-6 6-3 6-2 in the fourth round to 11th-seeded Croat Borna Coric.
Both players received code violations for racquet abuse but, as ever, it was Kyrgios providing all the talking points.
He approached chair umpire Gianluca Moscarella to sarcastically congratulate the Italian's controlling of the match after receiving his point penalty while down game point serving at 2-4 in the deciding set.
Having already been warned for his behaviour, Kyrgios was left fuming.
With the match all but lost, he shook left hands with the official at the ensuing changeover before he continued to berate him during the sit-down.
"Really good job. Well done," he said.
"You've controlled the environment really, really well."
Kyrgios's earlier complaints to the umpire about crowd disturbances had fallen on deaf ears.
"You've done nothing to keep the fans from yelling out," he said.
Moscarella said the fans were merely "enjoying themselves" but Kyrgios was unrepentant after the match, again taking aim at his courtside hecklers.
"They paid money to see me play and they just screamed out ridiculous things, and I'm just not going to take it anymore," Kyrgios said.
"I played for two hours and 20 minutes, and the guy yells at me: 'Play some tennis!'
"I'm not going to take it, so I just said 'F you' to him.
"Probably not needed but at that time I'd been competing and in the heat of the moment, and it's not what you want to hear."
The crowd certainly would have enjoyed Kyrgios's extraordinary shot making.
After calling the trainer to have his knee strapped after just three games, the temperamental talent pulled off an audacious on-the-run tweener winner past the advancing Croatian on the way to taking the opening set from 3-1 down.
"Get outta here, Nick Kyrgios. That's insanely good," a commentator gushed before the Australian once again mentally unravelled.
The giant-killing run of Kyrgios's countryman Jordan Thompson came to an end with a 7-5 7-5 fourth-round loss to South African sixth seed Kevin Anderson.
Top seed Novak Djokovic was upset by Spanish 22nd seed Roberto Bautista Agut 1-6 7-5 6-3, ending the Serb's bid for a record seventh Miami crown.
Others to progress to the quarter-finals were defending champion John Isner and American compatriot Frances Tiafoe, 18-year-old qualifier Felix Auger-Aliassime and fellow Canadian teenager Denis Shapovalov.
Federer's scheduled fourth-round match against Daniil Medvedev was postponed until Wednesday because of a long rain delay.
