Record-shattering Novak Djokovic said he was “hanging in there” after becoming the first player to win 400 Grand Slam matches Saturday on his way into the last 16 at the Australian Open. The 38-year-old Serbian great swept past Dutchman Botic van de Zandschulp 6-3, 6-4, 7-6 (7/4) in front of a boisterous crowd on centre […]