Yulia Putintseva of Kazakhstan serves the ball to Serena Williams of the United States during the women's first round of WTA Madrid Open in Madrid, capital of Spain May 5, 2013. Serena Williams won 2-0. (Xinhua/Xie Haining) 

Yulia Putintseva of Kazakhstan returns the ball to Serena Williams of the United States during the women's first round of WTA Madrid Open in Madrid, capital of Spain May 5, 2013. Serena Williams won 2-0. (Xinhua/Xie Haining) 

Serena Williams of the United States returns the ball to Yulia Putintseva of Kazakhstan during the women's first round of WTA Madrid Open in Madrid, capital of Spain May 5, 2013. Serena Williams won 2-0. (Xinhua/Xie Haining) 

Serena Williams of the United States returns the ball to Yulia Putintseva of Kazakhstan during the women's first round of WTA Madrid Open in Madrid, capital of Spain May 5, 2013. Serena Williams won 2-0. (Xinhua/Xie Haining) 

Yulia Putintseva of Kazakhstan returns the ball to Serena Williams of the United States during the women's first round of WTA Madrid Open in Madrid, capital of Spain May 5, 2013. Serena Williams won 2-0. (Xinhua/Xie Haining) 

Serena Williams of the United States serves the ball to Yulia Putintseva of Kazakhstan during the women's first round of WTA Madrid Open in Madrid, capital of Spain May 5, 2013. Serena Williams won 2-0. (Xinhua/Xie Haining) 

Serena Williams of the United States serves the ball to Yulia Putintseva of Kazakhstan during the women's first round of WTA Madrid Open in Madrid, capital of Spain May 5, 2013. Serena Williams won 2-0. (Xinhua/Xie Haining) 

Yulia Putintseva of Kazakhstan returns the ball to Serena Williams of the United States during the women's first round of WTA Madrid Open in Madrid, capital of Spain May 5, 2013. Serena Williams won 2-0. (Xinhua/Xie Haining)