Dimitrov splits with longtime coach Vallverdu

Grigor Dimitrov is moving on from longtime coach Dani Vallverdu after three years, he announced on social media Tuesday.

"After my match yesterday, Dani Vallverdu my longtime coach and I sat down together," Dimitrov wrote. "After three great years, we will be going our separate ways. We had some career highlights and amazing moments on court.

"I want to thank Dani for everything he has done for me and I wish him nothing but the best in his next endeavors."

Dimitrov hired Vallverdu in July 2016 after dropping to 40th in the ATP rankings. The move paid immediate dividends, as the Bulgarian reached the quarterfinals of the Rogers Cup in Toronto later that month and the semifinals of the Western & Southern Open in Cincinnati.

Dimitrov finished 2016 ranked 17th and carried that momentum to a career season the following year. He began 2017 with a semifinal run at the Australian Open and ended it within the ATP's top three after capturing the year-end ATP Finals crown. Dimitrov went 49-19 in 2017 while winning four titles under Vallverdu's guidance, including his first Masters 1000 championship.

The 27-year-old has struggled since then, dropping to No. 49 in the world rankings - his lowest rank since 2012 - after a third-round loss at the Barcelona Open in April. Dimitrov is just 9-6 this season, and he fell to Taylor Fritz on Monday in his opening match at the Madrid Open.