Ardron led Canada to the 2015 and 2019 World Cups but has been absent from his national side since 2021, during which Canada missed out on the 2023 World Cup and dropped out of the top 20 world rankings for the first time.
With a new head coach in place — Australian-born Steve Meehan — the 34-year-old Ardron answered a call to return and on Friday secured his 39th cap as Canada began their campaign to qualify for the 2027 World Cup in Australia.
Prior to Friday's win, Canada had lost 14 of their last 15 Tests against the United States. Now, they have taken a major step towards World Cup qualification.
Later, Tonga led 20-6 at halftime and went on to beat Samoa 30-16 in the Tonga capital Nuku'alofa.
The top three teams from the Pacific Nations Cup apart from Fiji and Japan who already have qualified will advance to the next World Cup. The last-place team will go to a qualifying playoff.
The Pacific Nations Cup involves Fiji, Japan, Canada, the United States, Samoa and Tonga.
Ardron had a hat-trick by halftime on Friday as Canada surprised the United States with their new fast-paced heads-up style based around an excellent lineout and tight-knit forward pack. Canada's phase play from quickly recycled ball and strong pick and go running was hard to counter.
"We talked a lot in sport about finding things that matter," Canada captain Lucas Rumball said. "It really mattered to us today.
"That was the focus of the game, just making it matter: every minute, every tackle, every pass, everything and I think we really showed it out there today."
Tonga's forward pack were outstanding at both ends of the field in their win over Samoa. The home team had surpluses of both territory and possession and finished scoring chances with precision.
Siosiula Moala and Sonatane Takulua scored first half tries for Tonga while Patrick Pellegrini kicked two conversions and two penalties. AJ Alitimu kicked two penalties for Samoa.
Tuni Tuitama scored a 60th-minute try for Samoa which cut the lead to 20-11 but Tonga pulled away again with a try to Samiuela Moli. Samoa finished with a superb try to Melani Nanai.
Next weekend in the second round of the tournament, Fiji host Tonga and Canada travel to Sendai, Japan. In the third and final preliminary round on September 6, Fiji and Samoa play at Rotorua, New Zealand and the United States host Japan at Sacramento, California.
The top four teams will advance to the semi-finals, and the playoff rounds are set to be played in the United States. Denver is hosting the semi-finals and fifth-place playoff on September 14 and Salt Lake City the third-place playoff and final on September 20.
