Del Potro in doubt for Argentinas Davis Cup semi-final

[NewsWhore]

Juan Martin Del Potro of Argentina serves to Novak Djokovic of Serbia during their men's singles quarter-finals match at the U.S. Open tennis tournament in New York, September 6, 2012. ...

More... (http://www.argentinastar.com/index.php?sid/209054155/scat/d9ed072d737073b4)