The 22-year-old said his retirement was due to a stomach upset rather than a protest over umpiring. During the tiebreaker, he was docked a point for inappropriate language.
"This is normal? You wait for 20 minutes to have to serve".
"You look at that match today and you think "wow, you have got a long way to go" and it's not about the tennis - it's more about him as a person, his attitude and his ability to move on from hard moments in matches, " Croft added. "He can go in a spiral and get in the doldrums and then it takes quite a lot to lift him", said Croft. "He then needs other people around him and the right advice that he can respond to and lift his spirits a little bit".
The Aussie will not be paid his first-round prize money as he refused to undergo a medical examination that could have confirmed the player's health problems.
He was assessed a $10,000 fine for unsportsmanlike conduct.More news: Making Way Towards North with Performance Booster: Adobe Systems Incorporated (NASDAQ:ADBE)
Combined, the fines totaled to more than USD31,000.
"Guys, I want to apologise to the fans in Shanghai and those that watched around the world on TV today", he posted on Twitter after the match.
"I've been battling a stomach bug for the last 24 hours and I tried to be ready but I was really struggling on the court today, which I think was pretty evident from the first point".
"My shoulder started to hurt in the practice which didn't help either and once I lost the first set I was just not strong enough to continue".
The tweet was later deleted.More news: Boy Scouts to recruit girls
For the second year running, Nick Kyrgios has come away from Shanghai in the red, financially speaking.
Last year, Kyrgios received a two-month suspension for a similar violation that occurred at the same venue, after he gave up his second round match against Germany's Mischa Zverev and rowed with spectators.
But that's not all.
He later added: "Exactly why I shouldn't come here".
"Obviously didn't have a great one past year, obviously got suspended after that". The #1 ranked Spaniard handily defeated Kyrgios with a 6-2, 6-1 victory.More news: Virginia governor candidates face off in final debate
During his 2017 episode in Shanghai, Kyrgios, who hit the ball out of the court in anger on one occasion, pondered out loud: "What's happening here?" at the regular movement of spectators.
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