Games: Federer 2-1 Nadal. Sets: 0-2

In the third game of the set, a long rally ends with Nadal being wrong-footed and his right knee apparently buckling under him. He looked in pain as he struggled back to his feet and called for the trainer. Despite producing a winner on the next point, his face is a picture of concern. Federer serves out and they make their way back to their seats as Nadal gets treatment.