The two began working together this past off-season, with Radwanska bringing on the 18-time Grand Slam singles champion in an effort to help win her first major title. But Radwanska has struggled this season, losing in the fourth round of the Australian Open and reaching just one semifinal, that at her hometown tournament in Poland.
Navratilova had only signed on to coach the 26-year-old for selective weeks, with Radwanska indicating that she had wanted more of a commitment. She appears to have kept on her regular full-time coach, Tomasz Wiktorowski, who was recently criticized by Radwanska's father and former coach following a pair of Fed Cup losses.
Martina steps down from coaching Radwanska pic.twitter.com/OPniEdOe5h— Tennis Channel (@TennisChannel) April 24, 2015
Radwanska lost in the opening round of this week’s tournament in Stuttgart to Sara Errani, 7-6 (8), 6-4.