Pakistan, Jan. 25 -- 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 court to extend his own all-time record of match wins at the majors. Roger Federer (369) and Serena Williams (365) are next best. Victory was also his 102nd at Melbourne Park, where he has won 10 titles, to equal Federer with most Australian Open singles wins.

Djokovic's reward is a fourth-round clash with either Czech rising star Jakub Mensik or American tournament debutant Ethan Quinn whose match w...