Gustavo Fernandez of Argentina returns the ball to Takashi Sanada of Japan during the men's singles 3rd round match of wheelchair tennis competition at the London 2012 Paralympic Games in London, Britain, on Sept. 4, 2012. Gustavo Fernandez won 2-1 to enter the quarterfinals.(Xinhua/Chen Yehua)

Takashi Sanada of Japan returns the ball to Gustavo Fernandez of Argentina during the men's singles 3rd round match of wheelchair tennis competition at the London 2012 Paralympic Games in London, Britain, on Sept. 4, 2012. Takashi Sanada lost 1-2.(Xinhua/Chen Yehua)

Takashi Sanada of Japan returns the ball to Gustavo Fernandez of Argentina during the men's singles 3rd round match of wheelchair tennis competition at the London 2012 Paralympic Games in London, Britain, on Sept. 4, 2012. Takashi Sanada lost 1-2.(Xinhua/Chen Yehua)

Takashi Sanada of Japan returns the ball to Gustavo Fernandez of Argentina during the men's singles 3rd round match of wheelchair tennis competition at the London 2012 Paralympic Games in London, Britain, on Sept. 4, 2012. Takashi Sanada lost 1-2.(Xinhua/Chen Yehua)

Takashi Sanada of Japan returns the ball to Gustavo Fernandez of Argentina during the men's singles 3rd round match of wheelchair tennis competition at the London 2012 Paralympic Games in London, Britain, on Sept. 4, 2012. Takashi Sanada lost 1-2.(Xinhua/Chen Yehua)