Nick Kyrgios has been fined US$16,500 for his conduct during a second-round defeat against Mischa Zverev at the Shanghai Masters on Wednesday.
The controversial Australian appeared to give up during a 6-3 6-1 loss to the German qualifier, at one stage looping a tame serve over the net before walking off court to gift Zverev the point.
Kyrgios also argued with a supporter who was unimpressed with his antics and later tweeted: "Not good enough today on many levels, I'm better than that. I can go on about excuses but there are none. Sorry."
The ATP reacted a day later by imposing a fine of $10,000 to the 21-year-old for a lack of effort, as well as £5,000 for the verbal abuse of a fan and a further £1,500 for unsportsmanlike conduct.
When asked if he understood the anger of the crowd in Shanghai, Kyrgios said in a media conference: "Not at all. I feel like if they knew what they were talking about they'd be on the tennis court and being successful as well.
"I can't really understand it at all. They don't know what I'm going through, so no, I don't understand it.
"I don't owe them anything. It's my choice. If you don't like it, I didn't ask you to come watch. Just leave.
"If you're so good at giving advice and so good at tennis, why aren't you as good as me? Why aren't you on the tour?'
"You want to buy a ticket? Come watch me. You know I'm unpredictable. It's your choice. I don't owe you anything. Doesn't affect how I sleep at night."