Toronto, ON, Canada, 26 July 2016 | tennis.com.au/AAP

Bernard Tomic has progressed to the second round of the ATP Toronto Masters with a straight-sets victory over Alejandro Gonzalez.

Yet fellow Aussie Nick Kyrgios suffered an upset first-round loss to local teenage wildcard Denis Shapovalov.

Kyrgios, the 11th seed, went down 7-6(2) 3-6 6-3 to 17-year-old Shapovalov, who just a few weeks ago won the boys’ singles title at Wimbledon.

Kyrgios arrived on court with his knee taped and struggled on serve throughout, producing an uncharacteristic 18 double faults.

He clinched the second set with a forehand winner but rapidly fell behind 3-0 in the third, a deficit from which he was unable to recover.

Stepping up to the line to serve for the biggest victory of his fledgling career, a nervous Shapovalov soon trailed 0-30 before swinging freely to claim a popular victory on a centre court packed with his home fans.

Earlier, Tomic, seeded 12th, posted a 6-4 7-6(1) victory in exactly 90 minutes, completing the win with a feathery dropshot from the baseline.

While not the cleanest match, Tomic was the clear aggressor, hitting almost three times the number of winners (34-12) and nearly double the unforced errors (41-22) of the Colombian qualifier.

Perhaps most impressively, the Queenslander finished the match a sparkling 12-from-12 at the net.

Tomic advanced to a second-round meeting with Canadian wildcard Steven Diez, who earlier upset Britain’s Kyle Edmund in three sets.

“I feel like here’s a good chance for me,” Tomic said.

“I really have to focus and really go for my shots and relax if I want to make a quarter or semi.”