quarterfinal
![](https://a.espncdn.com/media/motion/2016/0124/dm_160124_ten_nishi_tsonga/dm_160124_ten_nishi_tsonga.jpg?w=660&r=16%3A9)
No. 1 Novak Djokovic slips into quarters to meet Kei Nishikori
Top seed Novak Djokovic outlasted a gritty Gilles Simon in five sets Sunday to set up an Australian Open quarterfinal against No. 7 Kei Nishikori, who topped Jo-Wilfried Tsonga in straight sets.