The Spanish champion claimed all six major titles under Juan Carlos Ferrero's guidance, his latest coming at this year's US Open.
Six-times major champion Carlos Alcaraz has ended his partnership with his coach Juan Carlos Ferrero in a shock move.
The 22-year-old Spaniard, has worked with his fellow Spaniard since he was a youngster, but revealed on Wednesday that the duo have "mutually agreed to go separate paths" ahead of the upcoming season.
Neither Alcaraz nor Ferrero has given a reason for the split.
World number one Alcaraz has not yet outlined if he plans to replace Ferrero.
"Thank you for making youthful ambitions into realities," Alcaraz said in a announcement.
"We started this path when I was very young, and over all this time you've guided me on an extraordinary journey, on and off the court.
"It has been a pleasure to experience every step of it so much with you."
Ferrero, 45, is a former world number one. He developed Alcaraz's abilities at his training facility near Murcia before guiding him to each of his six major championship titles.
This sudden coaching change represents the conclusion of a trophy-laden player-coach relationship that defined the early career of one of tennis's brightest stars.
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