Sinner beats dizziness, Rune in round four

JANNIK Sinner battled dizzy spells on Monday to reach an Australian Open quarter-final against Alex de Minaur, admitting a long interruption when he accidentally broke the net was "big, big luck".

- AFP @ Melbourne

The world number one and defending champion dropped a set before coming home 6-3, 3-6, 6-3, 6-2 against Danish 13th seed Holger Rune on Rod Laver Arena. Sinner struggled in the hot Melbourne conditions, his hand visibly shaking and his heart rate taken in the third set before he left court for a medical timeout. There was then a bizarre 20-minute delay when Sinner demolished the metal brace that secures the net to the floor with a thunderous serve early in set four. "I was not feeling really well. You know, I think we saw