Petra Martic of Croatia returns the ball to Venus Williams of U.S. during their women's singles match at the Qatar Open tennis tournament in Doha

Venus Williams of U.S. returns the ball to Petra Martic of Croatia during their women's singles match at the Qatar Open tennis tournament in Doha

Shuai Peng of China serves to Nadia Petrova of Russia during their women's match at the Qatar Open tennis tournament in Doha

Nadia Petrova of Russia serves the ball to Shuai Peng of China during their women's match at the Qatar Open tennis tournament in Doha