Del Potro in doubt for Wimbledon after injury at Queen’s
LONDON — Juan Martin del Potro could be in doubt for Wimbledon after withdrawing from the Queen’s Club grass-court event because of a right knee injury on Wednesday. The 12th-ranked Del Potro beat Denis Shaovalov 7-5, 6-4 in the first round but finished the match with pain and swelling in his right knee after slipping