Novak Djokovic, the world no. 1 has moved into the semi-finals of the Australian Open after his opponent Kei Nishikori retired due to injury. Djokovic prior to Nishikori’s injury was trailing by a lead of 6-1 and 4-1 when Nishikori decoded that he was unable to continue any further into the competition due to his … Continue reading Australian Open; Novak Djokovic into semi-final after Kei Nishikori retires injured