Kei Nishikori advanced to the fourth round at the Australian Open for the sixth straight year with a 6-4, 6-4, 6-4 win over Lukas Lacko, a qualifier ranked 121st. The 2014 U.S. Open finalist has not lost to a player ranked outside the top 100 since he was beaten by 179th-ranked qualifier Daniel Evans in the first round at the 2013 U.S. Open.