MAGNUS Norman has called time on his partnership with Stan Wawrinka, bringing to an end one of tennis’ most successful coaching relationships in recent years.

When Wawrinka first hired Swede Norman in April 2013 he was ranked 17th and his best performance at grand slam level consisted of two quarter-finals.

Norman had an immediate impact, helping Wawrinka reach his first semi-final at the US Open later then year and then, in January 2014, guiding him to his first slam title in Australia.

In the nearly four years since, Wawrinka has won two more slam titles at the French Open and US Open and reached the final again in Paris this year.

He has failed to reach the last eight at only four of the last 16 slams he has contested and has been ranked as high as No 3.

Norman, who reached No 2 in the world in his own playing career, said the decision was a personal one to enable him to spend more time with his young family.

“After much thought I have decided to dedicate my future to my family,” Norman, 41, said in a statement.

“I could not have had a better player to work with and this has been one of the most difficult decisions I have ever had to make.

“I’m really honoured to have worked with Stan, who is a great tennis player, but more importantly a fantastic person.”

Wawrinka said: “I would like to thank Magnus for the amazing four years we had together. I will always be grateful for the work and the time he spent on me to make me improve and become a three times grand slam champion.

“He was not only part of my team but also part of the family,” Wawrinka added.