Spain's Rafael Nadal executes a backhand return to Argentina's Diego Schwartzman during their fourth round match at the Australian Open in Melbourne yesterday. Pic/AP, PTI

Rafael Nadal battled through a huge test to make his 10th Australian Open quarter-final yesterday as Grigor Dimitrov ousted Nick Kyrgios to join him into full gear. On an overcast and muggy day at Melbourne Park, the Spanish World No 1 was up against his most dangerous opponent yet in pocket rocket Diego Schwartzman, one of the smallest men on tour.