Russian world number two Daniil Medvedev reached the Australian Open fourth round with a straight-set win over Dutchman Botic van de Zandschulp.
The US Open champion plays Australian wildcard Christopher O'Connell or American Maxime Cressy in the last 16.
Neither O'Connell, 27, or Cressy, 24, have previously reached the fourth round of a Grand Slam.
After coming through an entertaining four-set match against Australian Nick Kyrgios, Medvedev encountered few problems against the only player to win a set against him on his run to the US Open title in September.
A break of serve in the third game of the opening two sets was enough to put the Russian, 25, in control of his third-round match - although the second seed did face a break point when leading 3-2 in the second.