MELBOURNE, Jan 25 (Reuters) - Alex ‌de Minaur reached back-to-back Australian Open quarter-finals on Sunday but the sixth seed acknowledged ‌he now faces one of the toughest challenges in tennis to keep his dream ‌Melbourne Park run going.

The 26-year-old Australian's reward for a 6-4 6-1 6-1 win over 10th seed Alexander Bublik was a showdown on Tuesday with world number one Carlos Alcaraz, a man he has not defeated in five previous meetings.