Bernard Tomic was defeated 6-3 6-4 6-3 by Mischa Zverev at Wimbledon on Tuesday.
Tomic, who was ranked as high as 17, admitted he was "bored" during his first-round lost.
"It was definitely a mental issue out there. Wasn't mentally and physically there to perform. I don't know why, but, you know, I felt a little bit bored out there to be completely honest with you," he said.
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"I tried at the end and stuff, he managed to win that set 6-3 or 6-4, but it was too late."
Tomic entered into a bizarre exchange with a reporter after being asked whether he would consider handing back his prize money.
"Which money?" he said. "Well, if you ask (Roger) Federer to give back $500 million, would he do that or not?"
Reminded that he had said he was bored, Tomic continued: "We all work for money. At 34, maybe I can donate to charity. If you ask Roger if he'll do it, I'll do it."
It is not the first time Tomic's attitude has been called into question. In 2012 he was suspended from Australia's Davis Cup team with Tennis Australia citing his poor attitude.
In 2014 he was booed on Rod Laver Arena after quitting with an injury against Rafa Nadal at the Australian Open.
His off-court behavior has also landed him in trouble - in 2015 he was arrested in Miami on charges of trespassing and resisting arrest after a late-night party.
Tomic said a lack of motivation was the problem.
"It's a roller coaster, and I just can't seem to find the commitment to work hard, to enjoy, and to lift trophies," he said. "Maybe I have to look at a few things, maybe play less tournaments. The last two years, nothing motivates."
One person on Twitter was so upset about Tomic's defeat on Tuesday he called on him to be deported from Australia.
"That's his opinion. I'm sure he's on the computer somewhere making $50 an hour," Tomic said. "I'm going to play another 10 years, and I know after my career I won't have to work again."
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