Del Potro comforts Almagro after he collapses in agony

Nicolás Almagro bursts into tears on court after his knee gives way against Juan Martin Del Potro in the second round.

The clay courts of Roland Garros host the second Grand Slam of the season. World number one Novak Djokovic has never triumphed in Paris. Roger Federer misses out injured, but Rafa Nadal, Andy Murray and defending champ Stan Wawrinka are all here.

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