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Controversial Australian Nick Kyrgios has withdrawn from the French Open through injury.
The fiery 23-year-old was seeded 21st at Roland Garros and was due to play fellow Australian Bernard Tomic in the first round.
However, Kyrgios has not played a singles match since April due an elbow injury and says he is not fit enough to return yet.
"Having consulted with my team and medical experts it is deemed too risky for me to step out and potentially play five sets on clay, especially as I have not played a singles match in nearly two months," he wrote on Twitter.
Australian Nick Kyrgios secured his first ATP Tour title on home soil as he beat Ryan Harrison in the final of the Brisbane International.
The 22-year-old fired 17 aces as he powered to a 6-4 6-2 victory over his American opponent on Sunday.
Kyrgios wrapped up the first set in 37 minutes despite having to save five break points along the way.
The third seed grabbed an early break in the second set and did not take his foot off the gas for the rest of the match as he clinched his fourth career ATP Tour title.
After his victory, Kyrgios told the ATP's official website: "I felt good all week. I felt right at home.
"Every time I stepped out here you (the fans) gave me such great support. I love playing in front of you guys even though sometimes it may not seem that way. But I do - I really appreciate it."
Seventh seed Damir Dzumhur beat Germany's Jan-Lennard Struff 6-1 6-4 in the opening round of the Sydney International.
There were also first-round wins for Paolo Lorenzi and Alexandr Dolgopolov over Jordan Thompson and Viktor Troicki respectively.
Nick Kyrgios has been stripped of his first-round prize money and fined an additional 10,000 dollars (approximately £7,500) after his controversial Shanghai Masters retirement.
The Australian left opponent Steve Johnson and umpire Fergus Murphy baffled when he shook hands and walked off court after losing the first set on a tie-break on Tuesday.
Kyrgios had become increasingly unhappy with Murphy and, after being given a point penalty for an audible obscenity during the tie-break, was heard to say he would quit if he lost the tie-break.
The 22-year-old later blamed a stomach bug but did not seek medical help on court and then went against ATP Tour rules by not having a medical examination following his retirement.
That has resulted in him losing the 21,085 US dollars (approximately £16,000) he would have earned in prize money.
The point penalty followed an earlier warning for smashing two balls angrily out of court, for which Kyrgios has been fined 10,000 dollars for unsportsmanlike conduct.
Explaining his withdrawal, Kyrgios wrote on Twitter: "I want to apologise to the fans in Shanghai and those that watched around the world on TV today.
''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 today, which didn't help either, and once I lost the first set I was just not strong enough to continue because I've not eaten much for the past 24 hours."
Kyrgios subsequently withdrew from his second-round doubles match on Wednesday.
This is the second year in a row where the Australian has found himself in hot water in Shanghai, although his punishment this time is much less severe than 12 months ago.
Kyrgios was fined more than 50,000 US dollars and banned from the ATP Tour for a lack of effort in his second-round match against Mischa Zverev, during which he argued with the umpire and fans.
Nick Kyrgios has blamed a stomach bug for his mid-match retirement at the Shanghai Masters.
The Australian caused controversy at the tournament for the second straight year by walking off after losing the first set of his opening round match against Steve Johnson.
Kyrgios served a ban from the ATP Tour last year after showing a lack of effort in a second-round match against Mischa Zverev and arguing with the umpire and fans.
Kyrgios looked distracted and grumpy from the start against Johnson and, after being given a point penalty for an audible obscenity midway through the tie-break, was heard to say he would quit if he lost the tie-break.
Johnson served it out 7-5 and Kyrgios promptly walked to the net to shake hands, to the bemusement of his opponent and umpire Fergus Murphy.
Murphy asked Kyrgios if he needed medical help but, with boos ringing out, the Australian put his rackets in his bag and walked off court.
Kyrgios had grumbled throughout about Murphy and the officiating and, with nothing obvious ailing him and no medical time-outs taken, it appeared frustration had got the better of him.
But the 22-year-old blamed illness in explaining his sudden departure, saying on Twitter: "Guys I want to apologise to the fans in Shanghai and those that watched around the world on TV today.
"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 today, which didn't help either, and once I lost the first set I was just not strong enough to continue because I've not eaten much for the past 24 hours.
"I'm hoping to be okay for the doubles and will make a decision tomorrow morning, hopefully off of a good night's sleep, which I didn't get last night!
"I'm gutted to be honest as I was keen to keep the good momentum that I built in Beijing going and finish the year strong. I'll do what I can to make sure I do."
Kyrgios arrived in Shanghai on the back of a run to the China Open final on Sunday, which he lost heavily to Rafael Nadal.
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