Murray and Petchey have been working together (Getty).

Andy Murray will have Mark Petchey as his full-time coach when he plays his first event since Wimbledon next week.

Petchey confirmed on Friday that he will quit as manager of men's national training for the Lawn Tennis Association to coach the 18-year-old Scot.

The pair began working together at the start of the current grasscourt season during which Murray has won his first ever matches on the ATP Tour.

He reached the third round of Wimbledon before losing to former finalist David Nalbandian in five sets on Centre Court.

"I'm so pleased to have Mark as my coach, I respect him a great deal," Murray said.

"He has helped me massively over the last few weeks and I am excited to work with him moving forward.

"The LTA have been very supportive of the plan we have put together and I appreciate their confidence and support."

Petchey, whose television commitments have been adapted to allow him to travel with Murray, said: "These past four weeks have obviously shown the tennis world what most insiders have known for some time.

"Andy has the ability and talent to make a real impact in the professional game, I look forward to doing my part in helping Andy to reach his full potential."

Murray, the US Open junior champion, will play in the grasscourt event in Newport, Rhode Island, next week, with two more tournaments in America to follow.

His world ranking is expected to rise by more than 100 places on Monday to just outside the top 200 which will gain him automatic entry into Challenger events and US Open qualifying.

The teenager is then likely to make his singles debut in the Davis Cup tie against Switzerland in Geneva in September, where he will come up against world number one Roger Federer.

Davis Cup captain Jeremy Bates added: "This should prove to be a productive collaboration for all involved.

"Andy will be a mainstay of our Davis Cup squad for many years to come and we want to provide him with every opportunity to ensure his professional success."

David Felgate, LTA national performance director said: "The Stella Artois and Wimbledon were effectively Andy's first real experience of big-time tour tennis.

"To perform as he has under the glare of publicity is a reflection of his determination and potential. We are delighted to be able to offer our support.

"We have full confidence in Mark and believe he is the best person to guide Andy through the rigours of the professional tour.

"Mark has made a significant contribution to British tennis over the last 20 months and as part of the LTA National Training team has overseen a significant improvement in our elite player's performances during that period. He leaves with our best wishes for the future."