Djokovic matches Nadal record with comeback win in China  TNT SportsChina Open and Japan Open: Novak Djokovic, Aryna Sabalenka and Naomi Osaka all advance, as Katie Boulter knocked out  Sky SportsDjokovic battles to maintain perfect Beijing record: ‘What a match to be part of’  atptour.comDjokovic says season has been ‘a big, big struggle’ after latest medical timeout  ReutersDjokovic survives China Open scare against wildcard world no. 104  afp.com