ABU DHABI: World number three David Ferrer saidon Sunday that he has split with coach Javier Piles after a 15-year working relationship. Ferrer, 31, who reached his first Grand Slam final this year at the French Open where he lost to compatriot Rafael Nadal, made his announcement at the Mubadala World Tennis Championship which gets underway in Abu Dhabi on Thursday. “I broke my relation with Javier, it was okay, we didn’t have any personal problems. We worked together for many years and we decided to end the coaching relationship,” said Ferrer. Ferrer and Piles had endured a close but sometimes roller-coaster relationship. The coach once locked Ferrer in a cupboard as punishment for a poor performance on the practice courts.