Belgian Justine Henin (2nd R) answers as Chinese Sun Tiantian (2nd L) reacts during a promoting activity of 2011 China Open in Lhasa, southwest China's Tibet Autonomous Region, Aug. 10, 2011. Former No.1 Justine Henin and the first Chinese tennis player who has ever won Olympic gold medal Sun Tiantian were invited to perform the exhibition tennis shows along the bank of Lhasa River and at the foot of the Potala Palace. [Xinhua]