Emma Raducanu split with coach Torben Beltz after only a five-month stint.
“I want to thank Torben for his coaching, professionalism and dedication over the last half a year,” said the Brit.
“He has a huge heart and I have enjoyed our strong chemistry during the time together.
“I feel the best direction for my development is to transition to a new training model with the LTA supporting in the interim.”
Last year, Raducanu made the surprising decision of letting go of Andrew Richardson, who was her coach during her maiden US Open triumph.
Raducanu was the first qualifier, male or female, to win a major.
The World No 11 brought Beltz, who has coached players like three-time Grand Slam champion Angelique Kerber, on board in November 2021.
The LTA’s head of women’s coaching Iain Bates will work with Raducanu in Madrid this week.
He will be the fourth coach the 19-year-old will be working with within a year.