Novak Djokovic has split from coach Boris Becker after three years working together.
Djokovic hired the former world number one ahead of the 2014 season in what was widely seen as a surprising move, but critics were silenced as the Serbian won six grand slam titles and dominated the sport.
Announcing the news on his Facebook page, Djokovic said: "After three very successful years, Boris Becker and I have jointly decided to end our cooperation
"The goals we set when we started working together have been completely fulfilled, and I want to thank him for the cooperation, teamwork, dedication and commitment.
"On the other hand, my professional plans are now directed primarily to maintain a good level of play, and also to make a good schedule and new goals for the next season. In this regard I will make all future decisions."
Formula One driver Jenson Button and former German tennis star Boris Becker have sent their best wishes to Michael Schumacher on his 45th birthday, as the seven-time world champion remains in hospital following a serious skiing accident.
Schumacher's family has reportedly been briefed by doctors this morning on his condition.