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Indian Wells finalist Juan Martin Del Potro has confirmed his place in the field for the AEGON Championships at Queen's Club in June.
The Argentinian world number seven enjoyed one of the best weeks of his career when he beat Murray and Novak Djokovic back-to-back at the BNP Paribas Open last week, the first player to get the better of the world number one this year.
He was also a set and a break up on Rafael Nadal in the final on Sunday but the Spaniard hit back to seal a stunning victory.
Grass has not been Del Potro's strongest surface but he showed his potential last summer when he beat Djokovic to win the bronze medal at the Olympic tournament at Wimbledon.
The 24-year-old said: "I like to play on grass, and at the AEGON Championships you feel like you are at home. They provide some great facilities for the players and it's a very good tournament.
"I have a fantastic memory from last year when I won the bronze medal at the Olympics. It was a magnificent experience for me. I had never played at an Olympics before so it was a big moment for me and my country.
"To win on grass at Wimbledon as well made it an even bigger moment. I think that if I play my best tennis I have a chance to win a grand slam tournament on grass, but it will be very difficult."
Del Potro was expected to be challenging for grand slam titles on a regular basis when he won the US Open in 2009 but a wrist injury ruled him out for almost a year and it has taken him time to get back to his best.
The Argentinian's best performance in his previous two appearances at Queen's Club came in 2011, when he made the third round, while he has never been beyond the last 16 at Wimbledon.
US Open champion Murray will be looking for his third title at Queen's, and Del Potro said: "Murray is a big champion, he already won a grand slam, he made the finals in Australia and he has everything he needs to be at the top in the future.
"He will be fighting for the number one place this year and he can take a big opportunity in the grass season."