Jannik Sinner swept aside concerns about his heat tolerance as he breezed to a 6-1 6-3 7-6(2) win over fellow Italian Luciano Darderi on Monday to reach his fourth Australian Open quarter-finals.
With the temperature rising to 33 degrees Celsius (91F) in the evening match at Margaret Court Arena, all eyes were on the defending champion following his dramatic cramping in the third round on a scorching day against American
