The Bulgarian defeated Rublev to advance to the fourth round after struggling in the third.
The top-Brit fell to lucky loser Bernarda Pera in the second round
The six-time Australian Open champion dismissed Donald Young in straight sets.
The 16-time major champion cruised past Victor Estrella Burgos in the first round
Venus Williams, John Isner, Jack Sock, Sloane Stephens and Coco Vandeweghe were among the Americans eliminated on day one of the Australian Open
The veteran coach shares his thoughts on coaching and the sport with Tennis View Magazine
Part two of the exclusive Tennis View interview with the veteran coach
Mark sat down with Tennis View Magazine to discuss coaching and life on the professional tour.
Marin Cilic, Dominic Thiem and Alexander Zverev won singles matches on Friday