Novak Djokovic says he and coach Boris Becker are splitting up after three seasons together.
Djokovic posted a statement on Facebook on Tuesday, saying the duo "jointly decided to end our cooperation."
Of Djokovic's 12 career Grand Slam singles titles — trailing only Roger Federer with 17, and Pete Sampras and Rafael Nadal with 14 apiece — six came while working with Becker.
Djokovic also was the runner-up at three other Grand Slam tournaments during his time with Becker, meaning the Serb made it to the finals at nine of 12 majors during their partnership.
But after completing a career Grand Slam with his first French Open title in June, Djokovic's season went off course. He was upset in the third round at Wimbledon and in the first round at the Rio de Janeiro Olympics and lost his No. 1 ranking to Andy Murray last month.