Juan Martin Del Potro has confirmed that he will warm up for Wimbledon by returning for a third appearance at Queens.
The Argentine believes that he will be in contention at SW19 if he plays his best tennis, even though grass is not his favourite surface.
"I like the surface," said Del Potro. "I'm not a grass-court specialist, but I'm improving.
"I think if I play my best tennis I have a chance to win a Grand Slam on grass but it will be very difficult."
Del Potro has already bagged one major championship - the 2009 US Open.
