The German had said in Monaco, where tension with Hamilton boiled over following a qualifying controversy, that winning was crucial to break the sister Mercedes' run of top form.
On Saturday in Canada, Rosberg - who had reclaimed the championship lead in Monaco - scored another victory over Hamilton, beating him to pole by a mere 7 hundredths of a second.
Asked about his new run of momentum, the 28-year-old said: "Well, it's just that little bit extra when you come here knowing you have the result behind your back.
"It just helps a bit," said Rosberg. "Lewis obviously had that winning streak and to bring that to an end was important."
For his part, Hamilton was ropable in Monaco, refusing even making eye-contact with Rosberg and earning a rebuke from Niki Lauda for failing to be gracious in defeat.
So after qualifying on Saturday, he made sure to pat Rosberg on the back.
"Nico did a fantastic job today," Hamilton told reporters, "so congratulations to him.
"It just wasn't the greatest qualifying session for me -- sometimes you have good ones, sometimes you have bad ones.
"Nico just did a better job," he added.
However, Rosberg may have moved to step up the off-track 'mind games' with Hamilton.
The major German daily Bild on Saturday quoted Rosberg as suggesting Hamilton sometimes copies his car setup.
"It's often the case that you have a great creative idea, but your teammate immediately has access to it. Quite clearly that's annoying," he reportedly said.