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Collins explained that she had been dealing with some health challenges over the last few months, including a diagnosis of endometriosis, and intimated that her plans to start a family had not proved as straightforward as she had hoped.
World No. 10 Prannoy was the last Indian to be eliminated on a day when his compatriot Sameer Verma, mixed doubles pair of Sikki Reddy and B Sumeeth Reddy and Aakarshi Kashyap in women's singles also bowed out.
Aakarshi Kashyap beat Australia's Kai Qi Bernice Teoh to progress to the quarterfinals.
The 22-year-old fourth seed is the first Italian to win the Melbourne Park title.
Bopanna also became only the third Indian to win a men's doubles Grand Slam title.
The Belarusian second seed is the first woman to retain the Melbourne Park title since compatriot Victoria Azarenka in 2013.
Sinner broke for a 3-1 lead in the fourth set and ran away with the match to snap the Serb's 33-match winning run at Melbourne Park and end his quest for a record 25th major.
Sinner's victory snapped Djokovic's winning streak of 33 matches at the Australian Open going back to 2018 and was the world No 1's first loss in 11 Melbourne semifinals.
Bopanna and his Australian partner Matthew Ebden prevailied in a tense semifinal against Tomas Machac and Zhang Zhizhen.
The German stunned second seed Alcaraz 6-1 6-3 6-7(2) 6-4 in the quarterfinals.
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