Martina Navratilova: Agnieszka Radwanska names new coach

Navratilova won 18 Grand Slam singles titles

Martina Navratilova will take on her first big coaching role after agreeing to work with Agnieszka Radwanska.

The 18-time Grand Slam singles-winner will link up with the world number six, 25, at the end of the year.

Navratilova, 58, said: "I can't wait to get started on this new phase of my career and I am really excited."

The Czech-born star will train with Radwanska for the first time after Christmas and work with Radwanska's full-time coach, Tomasz Wiktorowski.

The nine-times Wimbledon champion added: "I did not sleep very well last night, thinking about getting back into match mode and the competitions."

Radwanska, a Wimbledon finalist in 2012, is confident Navratilova's presence will help her earn a first Grand Slam success.

"Her achievements speak for themselves and I hope that I can learn from all her experience," said the Pole.

"She is my tennis idol. We are originally from a similar part of the world, so we share an understanding about tennis and life, which I'm sure will translate into a successful relationship."

British number one Andy Murray congratulated Navratilova and Radwanska on Twitter and wished them luck for 2015.