World number one Iga Swiatek is looking for a new coach after splitting with Tomasz Wiktorowski following three years working together.
Wiktorowski, 43, joined Swiatek's team as coach in 2022 when she had one Grand Slam success to her name.
The Pole helped Swiatek to four further Grand Slam titles, including three successive French Opens.
She became the first Polish player to reach world number one in April 2022 and has spent the past 123 weeks on top of the rankings.
"After three years of the greatest achievements in my career, together with my coach Tomasz Wiktorowski we decided to part ways.