Maria Sharapova of Russia takes a practice session at the Melbourne Park January 11, 2008 ahead of the Australian Open tennis tournament, which begins on Jan. 14, 2008.(Xinhua Photo)

China's Zhang Shuai returns the ball during a second round match against Elena Baltacha of Britain of the women's singles qualifications in the Australia Open Tennis Tounament at Melbourne Park in Melbourne, Jan. 11, 2008. Zhang Shuai won 2-0.(Xinhua Photo) China's Yuan Meng returns the ball during the second round match against Eva Hrdinova of the Czech Republic of the women's singles qualifications in the Australia Open Tennis Tounament at Melbourne Park in Melbourne, Jan. 11, 2008. Yuan Meng won 2-1. (Xinhua Photo) Maria Sharapova of Russia takes a practice session at the Melbourne Park January 11, 2008 ahead of the Australian Open tennis tournament, which begins on Jan. 14, 2008.(Xinhua Photo) Maria Sharapova of Russia takes a practice session at the Melbourne Park January 11, 2008 ahead of the Australian Open tennis tournament, which begins on Jan 14, 2008.(Xinhua Photo) China's Yuan Meng returns the ball during the second round match against Eva Hrdinova of the Czech Republic of the women's singles qualifications in the Australia Open Tennis Tounament at Melbourne Park in Melbourne, Jan. 11, 2008. Yuan Meng won 2-1.(Xinhua Photo)