Buenos Aires: World No. 4 Argentine tennis star Juan Martin del Potro has fractured his right knee cap, initial medical tests said. “It’s a very difficult time ... it’s a hard blow that leaves me without any strength mentally. It makes it very difficult for me to get back to recovery. I didn’t expect it,” said Del Potro in a statement.

The Argentine player will continue to rest, as his doctors have instructed on Sunday, until he undergoes new tests that will determine more specifically the extent of the injury, Efe news reported.

In the 10th game of the first set against Coric on October 11, Del Potro fell to the ground and after being attended and having a bandage installed returned to the match intending to continue.