World number one Novak Djokovic thanked his long-time fitness coach Marco Panichi for his years of service on Tuesday, signaling the end of their working relationship in the latest shakeup in the 24-times Grand Slam winner's camp.

The Serb said last week that he was considering going without a coach after ending a five-year partnership with Croatian coach Goran Ivanisevic last month, following his early exit from Indian Wells.