Another Djokovic row as dizzy Sinner enters Aus Open quarters

Novak Djokovic was at the centre of another Australian Open row on Monday while Jannik Sinner needed medical attention in fierce heat to battle into the quarter-finals and Iga Swiatek won easily.

- Agencies

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But American teenage qualifier Learner Tien's fairytale run is over after he suffered a thigh problem in a four-set defeat to Italy's Lorenzo Sonego.

With temperatures rising above 30 Celsius (86 Fahrenheit) for a second successive day, Ukraine's Elina Svitolina beat Veronika Kudermetova --then declined to shake the Russian's hand.

But Svitolina's husband, the 38-year-old Frenchman Gael Monfils, retired from his match in the last 16.

Five-time major champion Iga Swiatek thrashed "lucky loser", Eva Lys 6-0, 6-1 in her bid to win a maiden Melbourne crown.

The 24-time Grand Slam champion Djokovic on Sunday refused to do a routine on-court interview after beating Jiri Lehecka to set up a quarter-final blockbuster against Carlos Alcaraz.

Afterwards he said it was in protest at Tony Jones, a top sports presenter with host broadcaster Channel Nine, who he accused of "insulting and offensive comments" towards him and Serbian fans.