The world number one retired against Marin Cilic after an upper right leg problem began troubling him the fourth set on Rod Laver Arena, with the Spaniard wincing in pain and limping as he struggled to continue. She will play second seeded Dane Caroline Wozniacki or veteran Spaniard Carla Suarez Navarro for a place in Saturday's final. Little separated Nadal and big-hitting Cilic until the injury struck, as they traded ferocious groundstrokes in an intense battle. Nadal's retirement follows the departure on Monday of Novak Djokovic, with his immediate playing future uncertain after an elbow injury flared. Really tough match," said the Belgian world number 37.

Source: Daily Nation January 23, 2018 12:36 UTC