Darren Cahill says he is ending his four-year coaching partnership with No. 1-ranked Simona Halep to take a 12-month break and spend more time at home with his family.

Cahill said on Instagram on Saturday that he wanted to offer "support as our children enter important stages of their lives with the final year of high school, sports and college preparations all becoming more time consuming."

With Cahill, Halep won the 2018 French Open, her first career Grand Slam title, and finished as the top player in the world for the second consecutive season.

"Thank you so much @darren_cahill for all your hard work and incredible support," Halep said on Twitter. "I was lucky to have you and what a journey we had."

Cahill, who is based in Australia, said he will continue to work as an ESPN television analyst at the Australian Open, Wimbledon and U.S. Open in 2019.