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Former world number one Novak Djokovic has split from his coach Marian Vajda for a second time. Serbia’s Djokovic, 34, lost the number one ranking to Russian Daniil Medvedev on Monday. The Serb, a 20-time Grand Slam winner, began working with Slovakian Vajda as a teenager in 2006 and the pair briefly split for one year in 2017. Djokovic and Vajda agreed to part company at the end of a 2021 season in which the Serb won three Grand Slams. Having been deported from Australia on the eve of the Australian Open last month, Djokovic returned to action in Dubai…