NEW YORK—Garbine Muguruza is no longer working with coach Alejo Mancisidor. The 21-year-old from Spain won her first WTA title and reached the Wimbledon final during their time working together.

However, the world No. 9 has not won a match since Wimbledon, losing her opening-round in Toronto and Cincinnati. The two were reported to have stopped working together following Cincinnati.

The Spanish coach indicated it was his decision, writing on Facebook, "I stopped the project because there were many differences and my values did not allow me to believe and follow it. Sometimes great successes make great people but destroy relationships."

He added that he hoped Muguruza would be happy, saying, "now you're a great player with no limits."

Muguruza has not named a new coach.