Tennis-Djokovic through to semi-finals after Nishikori retires hurt

Novak Djokovic reached the semi-finals of the Australian Open on Wednesday after Kei Nishikori retired hurt when trailing 6-1 4-1 in their quarter-final.

Nishikori had a medical time-out between sets, with the trainer working on a right thigh problem. Top seed Djokovic will meet Lucas Pouille for a place in the final. (Editing by Amlan Chakraborty)