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Iga Swiatek has split with long-time coach Piotr Sierzputowski, the Polish tennis star announced via social media post on Saturday.

The 2020 French Open Champion first started working with Sierzputowski in 2016 when she was just 15 years old.

“I would like to thank you Coach for everything that you did for me,” Swiatek wrote, “We gave each other so much and I hope that we’ll continue to grow and develop with this experience we’ve gained together.”

Swiatek finished No. 9 in the world rankings, clinching two tour titles this year.

“This change is really challenging for me and this decision wasn’t easy either,” said Swiatek, “I found out that sometimes in our professional life we need changes to develop more, evolve and meet other people with whom we’re going to create a cooperation for the next stages of our development.”

The 20-year-old has yet to announce her next coach.