Murray came through his comeback match in one hour 25 minutes

Murray, who missed the French Open and Wimbledon because of a wrist injury, was playing his first match since May.

Ginepri and Murray swapped breaks in each set but the American did not prove a real test for the British number one.

Murray will face Italian Fabio Fognini at 1600 BST on Wednesday and could face Roger Federer in the next round.

Interview: Andy Murray

Interview: Brad Gilbert

I'm still holding back but hopefully I'll be able to hit it bigger with each match Andy Murray

"I missed being out on the match court," Murray said after beating Ginepri. "It was good and went well out there.

"But it was quite tough, I had to do lots of defending and block returns but my first serve was going great."

Murray injured his wrist at the Hamburg Masters, and has had to delay his comeback on the US hard courts to continue specialist treatment.

The Scot, who slipped to 13th in the world during his absence, was pleased to come through unscathed in Montreal, and says his wrist will continue to improve.

"I didn't have any pain but it was such a bad injury that it takes time to build up my confidence on it," Murray said.

"I'm still holding back but hopefully I'll be able to hit it bigger with each match."

606: DEBATE We can proudy proclaim that Andy Murray is back with a vengeance PL

Murray's coach Brad Gilbert believes the Scot will be "back to 100% within a couple of weeks".

"He is already miles better than he was a few weeks ago," Gilbert told BBC Five Live. "But any time you have been out for a while and you think about something a little bit, it makes you a bit tentative.

"The more matches he plays over the next few weeks, the better it will be for his body and his game.

"It was killing Andy not to be out there playing, especially the last three weeks where the standard in some of his favourite tournaments has been very weak.

"He didn't get a chance to be a part of it but it only makes your stomach burn more."

American James Blake set up a second-round battle with Lleyton Hewitt after he eventually saw off Austrian Juergen Melzer 7-5 7-6 in a tight contest.

Former world number one Marat Safin only needed three games to set up a meeting with Rafael Nadal as his opponent Robin Soderling retired injured at 2-1 in the first set.