Asia’s first grand slam singles champion Li Na has called time on her 15-year tennis career due to “chronic” knee injuries.
http://edition.cnn.com/2014/09/19/sport/tennis/li-na-retirement/index.html?hpt=isp_c1

Asia’s first grand slam singles champion Li Na has called time on her 15-year tennis career due to “chronic” knee injuries.
http://edition.cnn.com/2014/09/19/sport/tennis/li-na-retirement/index.html?hpt=isp_c1