The world number one ends a hugely successful, seven-year partnership with coach Goran Ivanisevic.
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Sabalenka’s match at the Miami Open has been moved back by a day following the death of her former boyfriend Koltsov.
Djokovic’s announcement follows his shock defeat last week to world number 123 Luca Nardi at Indian Wells.
Nardi said it was ‘crazy’ that he beat the 24-time Grand Slam champion after qualifying for the match as a lucky loser.