Former world No. 2 Alex Corretja thinks Novak Djokovic must find a new coach before the French Open. Djokovic stunned the tennis world when he confirmed the news of him and his long-term coach Marian Vajda splitting. “I think these kinds of top players, we see that they all need a super ex-coach or a super ex-player, someone who knows the feeling of being there, and they need someone that they have got a lot of confidence in,” Corretja told Eurosport. “Someone that is doing the dirty job, let’s say, Marian [Vajda], he is an ex-coach, an ex-player; he is someone that knows the game very well. It is very uncommon …