Andy Murray needed little more than an hour to reach the quarter-finals of the Rogers Cup ahead of his doubles date against his brother later in Montreal.
Murray, playing for the third day in a row after defeating Tommy Robredo in a clash that was held over until Wednesday afternoon, made light work of Gilles Muller.
The 2009 and 2010 champion claimed a routine 6-3 6-2 victory in 65 minutes and will be back on court later on Thursday alongside Leander Paes against sibling Jamie and his doubles partner John Peers.
Murray started sluggishly and found himself 0-40 down on serve in the opening game although the Scot battled back to hold as Muller wasted four break points.
The world number three, who will move up to second in the rankings if he reaches the final, took the initiative in the fourth game, breaking with a delightful lob and rarely looked back from there.
Murray saw out the game with little cause for concern to book a last-eight spot against either Jo-Wilfried Tsonga or Bernard Tomic.