The giant Argentine tennis star Juan Martin del Potro survived an injury scare to reach the second round of the French Open with a four sets win over Spain's Albert Montanes.
On a sweltering day in Paris the ninth-seeded Del Potro, the 2009 US Open champion, needed treatment on his left knee at the end of the second set before going on to win.
The unseeded Frenchman Nicolas Mahut beat the injury-plagued American Andy Roddick in four sets.
The top seeds Novak Djokovic and Victoria Azarenka play their opening matches tonight.
