Juan Martin del Potro facing Wimbledon fitness battle after Queen's withdrawal

Juan Martin del Potro's Wimbledon preparations have been thrown into disarray after the Argentine was forced to pull out of next week's Aegon Championships at Queen's Club with a groin injury. Former US Open champion Del Potro, ranked 30 in the world after a steady rise up the rankings following a succession of career-threatening wrist injuries, also pulled out of this week's grasscourt event in Den Bosch.

It means the Argentinian faces the prospect of arriving at Wimbledon without any grasscourt matches under his belt. Queen's, which features world number one and Wimbledon champion Andy Murray and world number three Stan Wawrinka, has also lost French Open champion Rafael Nadal after he withdrew to recover after his triumph at Roland Garros.

Australian Thanasi Kokkinakis and Briton James Ward have been awarded main draw wildcards.