"My fall was not linked with lack of attitude and lack of practising," said Bublik, who has been criticised for his on-court behaviour, external and racquet smashing.
"I just burned out because I was waiting for the results to come. I got to the point of 'OK, why am I sacrificing so much? For what?'
"It was a good three days [in Vegas]. I let it all out.
"I said, I'm useless now, I can't win a match, so let it be - let's see how it goes."
Bublik is the lowest-ranked man to beat two top-10 opponents at Roland Garros since the 100th-ranked Andrei Medvedev beat Pete Sampras and Gustavo Kuerten to reach the 1999 final
Bublik then went from Vegas to Phoenix, Arizona, for a Challenger event, landing just five hours before his first match.
He went on to make the final, denied only by talented teenager Joao Fonseca. Two months later, he won the title in Turin.
But it is in Paris where he has truly shone. Armed with a remarkable range of shot-making, including an utterly devastating drop-shot, he has thrilled the crowds on his way to his best Slam result.
Bublik, who has a two-year-old son, has long been clear that tennis is not everything.
"Tennis is 50% of my life. I have other parts - being a dad, being a friend - which have the same importance to me," he said.
"I will not put my health on the line. I'm not going to fight through injuries.
"If you tell me I will win a Slam but won't be able to walk by 40, I'm not going to take the Slam."
That freedom has helped Bublik become the lowest-ranked man to earn two wins over top-10 opponents at Roland Garros since 1999.
None of his four ATP Tour-level titles or 11 finals have come on clay - a surface on which his 41% win rate before this French Open represented his lowest across all surfaces.
But Bublik is, crucially, enjoying his time on court - and is all the more dangerous for it.
"I'm the guy you can see having a nice time down the street in Paris in the evening before a match," Bublik added.
"I'm social. I can skip practice if I don't feel [it]. I think it's pretty normal.
"This craziness that social media put in us, that we have to be the best version of ourselves?
"No - we just have to be ourselves."
