Sports
Juan Martin del Potro to undergo fourth knee operation, targets playing at Tokyo Olympics
Juan Martin del Potro has not played since June 2019 after fracturing his kneecap at the Queen's Club Championships in London.
Sports
Juan Martin del Potro to undergo another operation on right knee to help him eliminate pain
Juan Martin del Potro had surgery in June but now needs another procedure because of pain that wouldn't let him run or jump and made walking up the stairs difficult.