The defending champion collapsed in his chair at a press conference following his win against Argentinian David Nalbandian, which saw him reach the fourth round of the US Open.

Whilst talking to journalists, the tennis player grabbed his face and collapsed in his chair. 

All journalists in the room were asked to leave immediately, so that medical officials could assess Nadal's condition. 

Once Nadal was feeling better the press conference continued. Nadal then explained that he fainted because of a painful cramp in his leg, following his match against Nalbandian.