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

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."