Tennis Tennis Del Potro a major ATP Finals doubt due to fractured patella Juan Martin del Potro said his latest injury blow is a "hard blow that leaves me without strength". Peter Thompson 15 October, 2018 00:54 IST Juan Martin del Potro limps out of the Shanghai Masters - Getty Images Peter Thompson 15 October, 2018 00:54 IST The luckless Juan Martin del Potro looks set to miss the ATP Finals after suffering a fracture to the patella of his right knee. Del Potro retired as a result of a fall during his third-round match against Borna Coric at the Shanghai Masters this week. The world number four looks unlikely to play in the season-ending showpiece in London next month after undergoing medical examinations on Saturday. Jorge Viale, the Argentine's spokesperson, revealed the 30-year-old was fitted with a splint on his right leg and will be informed by doctors of a recovery process in the coming days. "It's a very difficult moment. I feel very sad. It's a hard blow that leaves me without strength," said Del Potro, runner-up at the US Open last month. "It's very difficult for me to think about recovery again, I did not expect this to happen." Subscribe to our daily newsletter Get your daily dose of Sportstar with handpicked stories delivered right to your inbox! SUBSCRIBE Please enter a valid email address.