Former US Open champion Juan Martin Del Potro has become the third big-name player to confirm his place in the field for the AEGON Championships at Queen's Club in June.
The Argentinian, will join defending champion Andy Murray and last year's runner-up Jo-Wilfried Tsonga at the Wimbledon warm-up event, which runs from 11-17 June.
Del Potro, 23, has played at Queen's twice before, reaching the third round last year, while his best performance at Wimbledon also came in 2011 when he lost against Rafael Nadal in the last 16.
He said: "I like the surface. I'm not a grass-court specialist but I'm improving. The AEGON Championships at Queen's is an amazing tournament, very nice to come to, to play, to train and I will be there for sure trying to win my first title on grass.
"I think that 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, currently ranked 11th, has looked back to something like his best form this year after spending last season finding his way again following a serious wrist injury.