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Grigor Dimitrov has parted company with coach Roger Rasheed.
The Bulgarian world number 11 beat Andy Murray at Wimbledon last year on his way to reaching the semi-finals.
But Dimitrov, who lost to Murray in the Australian Open fourth round and was beaten in the first round of the French Open, lost in straight sets to Richard Gasquet in the third round this year.
"I want to thank Roger for all his hard work and support over the past couple of years," said the 24-year-old.
Dimitrov said he had decided to end his working relationship with Rasheed "after much thought", and added: "We had many accomplishments together and I wish him all the best going forward."