Andy Murray beat Marcel Granollers in straight sets in his first match as Wimbledon champion at the Rogers Cup in Montreal.
Exactly a month after beating Novak Djokovic to win his second grand slam title, Murray fought back from 5-2 down in the second set to defeat Spaniard Granollers 6-4 7-6 (7/2).
The Scot, who was given a bye in the opening round, had warned he would be rusty, and it was not until the sixth point of the match that he won one.
But Murray soon found his rhythm on the surface where he is most at home and reeled off four games in a row.
The world number two was playing aggressively and powering winners with both his backhand and forehand.
Granollers was the last player to beat Murray, in Rome in May, although the Scot had just levelled that match at one-set all when he pulled out with a back problem.
Murray subsequently missed the French Open before going unbeaten on grass with titles at both Queen's Club and Wimbledon.
Granollers fought his way back into the first set by retrieving one break in the sixth game after Murray had saved two break points.
It was tight from there on but a missed backhand from the Spaniard, the champion on clay in Kitzbuhel last week, handed Murray the set.
The windy conditions were beginning to cause problems for Murray, the champion in Canada in 2009 and 2010, and a miscued forehand gave Granollers a break for 3-1 in the second set.
Murray may have the inner peace of having achieved a lifetime's ambition, but he was fighting frustration as his 36th-ranked opponent stayed well in control of the set.
Granollers could not close it out, though, Murray saving one set point and then breaking back with some fine baseline play.
Still it was not straightforward but he forced a tie-break and from 2-0 down won seven points in a row to clinch victory after an hour and 50 minutes.
Murray rated his performance "okay" and revealed he missed the satisfaction of hearing himself announced as Wimbledon champion for the first time because he does not understand French.
He told Sky Sports 3: "It was tricky. It's extremely windy here and the balls that they use in the Masters series on the hard courts are very quick and hard to control so I felt like the ball was flying around a little bit.
"I didn't have my timing, especially at the beginning of the second set. But it was good to come through, he's been playing very well.
"It's just good to get back on the court. The nerves were there, which I really like. It shows that I'm ready to move forward and not focus too much on what happened a few weeks ago. I want to try to do well here in Canada and in the States."
In the third round Murray will play Latvian Ernests Gulbis, a hugely talented if temperamental player who made headlines at the French Open when he called the top four boring.
Murray said: "He's a very tough player, he's very talented. He's caused a lot of the top players problems in the past.
"He goes for it so he dictates a lot of the match, he can serve 140mph and if he serves well he's very tricky. I'll need to play a little bit better than today if I want to come through that."