Lewis Hamilton won the Canadian Grand Prix and dedicated his victory to Muhammad Ali , who died last week.
The Brit closed the gap to teammate Nico Rosberg at the top of the Drivers' Championship to just nine points after the German finished fifth.
As he took the chequered flag, Hamilton said on his team radio: "Float like a butterfly, sting like a bee. That was for Muhammad Ali."
A tactical error from Ferrari gifted Hamilton victory after Sebastian Vettel had leapfrogged both Mercedes cars at the start.
Ferrari opted to pit the former world champion twice, allowing Hamilton to take his fifth Montreal victory.
Rosberg spun on the penultimate lap attempting to pass Max Verstappen, with Valtteri Bottas finishing third.
Hamilton, who claimed the 53rd pole of his career, was joined on the front row at the Gilles-Villeneuve Circuit by Rosberg for the first time since their sensational first-lap collision at last month's Spanish Grand Prix.
But it was the fast-starting Vettel who led into turn one after getting the jump on both Mercedes drivers.
Hamilton, not for the first time this year, was particularly sluggish out of the blocks and as he moved to defend second from Rosberg, the Mercedes pair banged wheels.
While Hamilton retained second place, Rosberg was left with little option than to take evasive action on to the grass, and when the German re-joined the circuit he found himself in ninth.
That soon became 10th after he was passed by Force India's Nico Hulkenberg. On lap three, Rosberg made his way ahead of McLaren's Fernando Alonso for ninth, but he was struggling to make any further inroads on the cars ahead of him.
Up front, Vettel led comfortably, but after the virtual safety car was deployed with Jenson Button parking his poorly McLaren, Ferrari decided to pit both Vettel from the lead and his team-mate Kimi Raikkonen, too.
It seemed a curious decision with Vettel, who was leading the race, subsequently dropping back to fourth, and having to commit to a two-stop strategy.
On lap 17, Vettel made his way past the first Red Bull of Daniel Ricciardo before making light work of Verstappen on the ensuing lap to move up to second.
At the end of lap 24, Hamilton would make his one and only visit to the pits, stopping for the soft rubber which afforded Vettel the lead once more.
But the four-time champion was back in the pits eight laps later for his second stop of the afternoon, allowing Hamilton to retake the lead. The gap was a little over eight seconds.
Elsewhere, Rosberg was making tentative progress through the pack before his troubled afternoon took another miserable twist when he suffered a puncture in the closing stages.
He pitted from fourth and rejoined in seventh. That soon became sixth when Rosberg past Ricciardo and then fifth after the German eased passed Raikkonen.
That is where Rosberg, winner of the opening four rounds of this season, would remain after he failed to find a way past Verstappen and spun at the chicane in attempting to do so on the penultimate lap.
While Vettel was taking small chunks out of Hamilton's lead it was proving to be slow progress, and when he made a mistake at the final chicane, it did not look as though Hamilton would be troubled.
And indeed he was not as he cruised to his second victory in a fortnight.
Elsewhere, Raikkonen finished sixth with Ricciardo seventh, while British rookie Jolyon Palmer retired after 17 laps.
Rosberg turned the airwaves blue with fury when he swore on live television.
"I'm really pi***ed off but that's racing," he said.
"I went around the outside in Spain and tried the same again today but Lewis did a really hard racing manoeuvre.
"Next time I will make sure I am in front.
"We touched and I was off and that was it.
"From then it was an uphill battle.
"Later it went really pear-shaped when it spun around. But I carried it back.
"When interviewer Sky's Rachel Brookes apologised to fans, he fumed: "I will apologise. you don't need to apologise for me.
