Novak Djokovic surged into an Australian Open quarter-final clash against Carlos Alcaraz with a dominant straight-sets victory on Sunday while women's world number one Aryna Sabalenka was a ruthless winner. Double defending champion Sabalenka is on a collision course with in-form world number three Coco Gauff in the semi-finals in Melbourne if both win in the last eight. On the hottest day of the tournament so far with temperatures hitting 34 degrees Celsius (93 Fahrenheit), Alcaraz went through when Britain's Jack Draper retired injured.