Borna Coric has stopped working with coach Miles Maclagan, his management team has announced.
The two began their partnership during the offseason.
"I would like to thank Miles for his hard work and dedication," said Coric, who added that he would examine "what the best solutions are going forward."
The 19-year-old has fallen to No. 41 from his career-high ranking of No. 33, but reached his first Masters quarterfinals in Cincinnati last month. He will return to competition for Croatia’s Davis Cup tie next week against France.