Li Na reaches semifinal of Tokyo Open in Tokyo . Title holder needs three sets to beat Stanislas Wawrinka . Agnieszka Radwanska powers into last four at China Open in Japan . Djokovic needed less than an hour to beat Austria 's Juergen Melzer 6-1 6-2 at one of his favorite venues . Li Na puts out defending champion Novak Djokovic .
Li Na reaches semifinal of Tokyo Open in Tokyo . Title holder needs three sets to beat Stanislas Wawrinka . Agnieszka Radwanska powers into last four at China Open in Japan . Li Na puts out defending champion Novak Djokovic .