Elina Svitolina has stopped working with coach Iain Hughes, who helped her reach a career-high ranking of No. 14 this season.
The Ukrainian also has former world No. 1 Justine Henin on her team as a coaching consultant, but Hughes had been her traveling coach for more than two years.
"I would like to thank Iain for everything he has done,” she wrote on Facebook. “He taught me many things on and off [the] court, made me a better player and helped to reach many goals. It was an invaluable experience to work with Iain.”