World No. 1 Novak Djokovic has split with his long-term coach Marian Vajda, according to Sport Klub. Coach Vajda was an integral part of Djokovic’s success, having spent 15 years working with the Serb. Djokovic and Vajda briefly split in 2017 but the two got back to working together in 2018. The split between Djokovic and Vajda comes amid the uncertain future of the 20-time Grand Slam champion. Djokovic, who wasn’t allowed to compete at the Australian Open because over his vaccine status, confirmed recently that he is still unvaccinated and that he is willing to skip tournament that introduce mandatory vaccination.Djokovic kicked off his season in Dubai Djokovic started his season last week in Dubai, where he suffered a shock straight-set defeat to Jiri Vesely in the quarterfinal. “Unfortunately, wasn …