Rafael Nadal, of Spain, returns the ball to Pablo Andujar, of Spain, during a semifinal match at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Saturday, Feb. 22, 2014. (AP Photo/Leo Correa)
Rafael Nadal, of Spain, returns the ball to Pablo Andujar, of Spain, during a semifinal match at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Saturday, Feb. 22, 2014. (AP Photo/Leo Correa)
Klara Zakopalova of the Czech Republic serves to Teliana Pereira of Brazil at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Saturday, Feb. 22, 2014. (AP Photo/Leo Correa)
Teliana Pereira of Brazil returns the ball to Klara Zakopalova of the Czech Republic at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Saturday, Feb. 22, 2014. (AP Photo/Leo Correa)
Klara Zakopalova of the Czech Republic returns the ball to Teliana Pereira of Brazil at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Saturday, Feb. 22, 2014. (AP Photo/Leo Correa)