Navratilova was brought on in December as one of the first supercoaches on the women's tour, a trend that has become increasingly popular on the men's tour, in the hopes that her 18 Grand Slam titles and former World No.1 status would bring the former World No.2 closer to her first Grand Slam title.
Radwanska, whose best result so far in 2015 has been a semifinal run on home soil at the Katowice Open, will continue to work with her main coach, Tomasz Wiktorowski. Here's the Radwanska tweet:
? Aga Radwanska (@ARadwanska) April 24, 2015
"I am stepping down as Agnieszka's part-time coach," Navratilova said in a statement.
"I think I underestimated the time it would take to make this a proper and good situation for both Agnieszka and me. I have quite a busy family life now as well as my TV work and other business commitments, which all combined make it impossible to dedicate the amount of time necessary to do a great job. Tomas Wiktorowski, Agnieszka's full-time coach, certainly knows what he is doing and he will be able to continue to build on some of the adjustments we were trying to make. I really enjoyed working with Aga and her whole team and I wish her all the best for the rest of the season."