Ivan Lendl has claimed that Andy Murray is a "great student" to coach ahead of the Brit's quarter-final encounter with Marin Cilic at the US Open.
Lendl, who won eight Grand Slams during a hugely successful career, was employed by the Murray camp at the end of 2011 to help the Brit claim his first major success.
"Andy's a great student," the 52-year-old told Eurosport. "He's great to work with, works very hard and he wants to get better."
Murray reached the Wimbledon final earlier this year under Lendl's guidance before losing to Roger Federer.
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