Novak Djokovic caught the tennis world unawares when he announced that his new coach would also be one of his greatest rivals: Sir Andy Murray.

Novak Djokovic and coach Andy Murray ended their partnership after six months, they said Tuesday. Djokovic announced in November that he hired Murray. The 24-time Grand Slam winner was ranked No. 7 in the world at the time.

Novak Djokovic is splitting with coach Andy Murray, just two weeks ahead of the French Open. The decision comes after Djokovic lost his opening match in his last two tournaments, both on clay.