Croatian Marin Cilic is through to the semi-finals of the Australian Open after No.1 seed Rafael Nadal retired from their quarter-final on Rod Laver Arena.

Nadal received treatment for a hip issue in the fourth set before he succumbed down a break in the fifth set with Cilic leading 3-6 6-3 6-7 (5-7) 6-2 2-0.

Cilic will meet British surprise packet Kyle Edmund in the semi-finals after he upset No.3 seed Grigor Dimitrov in four sets.