Martina Navratilova 's brief stint as coach of 2012 Wimbledon runner-up Agnieszka Radwanska is finished . Navratilova , who won 18 Grand Slam singles titles as a player , and Poland 's Radwanska , who is currently ranked No 9 , issued statements on Friday to announce the parting . They announced in December that they would work together . Martina Navratilova watches Agnieszka Radwanska in action during this year 's Australian Open . Radwanska has struggled this season and was knocked out in the first round in Stuttgart this week . Radwanska is only 13-11 this season , including a first-round loss on Wednesday in a clay-court tournament at Stuttgart , Germany . A statement posted to Radwanska 's Twitter account thanks Navratilova 'for her time and efforts over these last few months ' and calls it a 'great experience to work with one of the all time greats . ' The post adds that the women 'agreed that as Martina could not commit 100 ( percent ) to the project then it was not going to work as a long term partnership . ' The French Open starts on May 24 . Radwanska plays a forehand during her defeat by Sara Errani at the Porsche Grand Prix on Wednesday .
Martina Navratilova could not commit '100 per cent to the project ' The pair only started working together in December last year . Agnieszka Radwanska is struggling for consistency this season . The Pole slumped to an early defeat in Stuttgart this week .