Defending champion Jannik Sinner battled dizzy spells on Monday in energy-sapping heat to reach the Australian Open quarter-finals, admitting a long interruption when he accidentally broke the net was “big, big luck”. The World No. 1 again dropped a set before coming home 6-3, 3-6, 6-3, 6-2 against Danish 13th seed Holger Rune on Rod Laver Arena with both men needing medical attention. 

Medical timeout