The deal is thought to be the biggest of its kind in tennis

The 19-year-old British No 1 will wear the bottled water company's brand logo on his left sleeve during tournaments.

The agreement with the Perthshire water company is reportedly the biggest shirt sponsorship deal in tennis.

Murray, from Dunblane in Stirlingshire, will first wear the logo when he plays in the Qatar ExxonMobil Open, due to take place in Doha on Monday.

Sally Stanley, marketing director of Highland Spring, said the company was delighted with the deal.

She added: "We're so enthusiastic about supporting Andy as his winning spirit is a breath of fresh air.

"He is a fantastic ambassador for British tennis and his natural talent and dedication to succeed is an inspiration to young people."