Two-time Grand Slam champion Garbiñe Muguruza took to Twitter on Tuesday to announce that she will no longer be working with longtime coach Sam Sumyk.
"Few words to announce the end of an Extraordinary ride," she tweeted. "Two Grand Slams and World No.1. Beyond grateful for this last four years."
Muguruza first paired with Sumyk in the summer of 2015, shortly after the Spaniard made her first major final at Wimbledon.
Less than a year after that runner-up finish to Serena Williams, she avenged the loss at Roland Garros for her first major title.
Muguruza then captured the Venus Rosewater Dish in 2017, defeating five-time champion Venus Williams in the championship match. That summer, she ascended to World No.1, becoming the first from her country since Arantxa Sánchez-Vicario back in 1995.
Winning her seventh career WTA title earlier this year at the Abierto GNP Seguros, she is yet to announce any further changes or additions to her coaching team.