Mercedes must be bulletproof in Formula 1: Nico Rosberg

Montreal: The twin Mercedes of Nico Rosberg and Lewis Hamilton have so dominated the Formula One circuit this season that even a second-place finish that extended Rosberg`s lead in the championship standings left them disappointed.

"We need to make sure that we`re bulletproof," Rosberg said after Daniel Ricciardo passed the hobbled Silver Arrow with two laps to go to win the Canadian Grand Prix on Sunday.

"Having lost the win, that`s very, very disappointing, definitely, and also disappointing for us as a team. We have such speed and such a great car, to not win the race and even just finish with one car and come second is hugely disappointing for us, definitely.

"Our ambition is to finish one-two so we need to make sure that we get back there again next race in Austria."

Mercedes had won every race in the series heading into Montreal, with Rosberg posting two victories and four second-place finishes. Hamilton won the other four races, finishing second in Monaco last month; he had engine trouble and did not finish the season opener in Melbourne.

That`s pretty much what it takes to knock the Mercedes off the top spots of the podium, and it happened again this week on the Circuit Gilles Villeneuve.

Both Rosberg and Hamilton had the same problem, at about the same time, the midpoint of the 70-lap race.

When Rosberg radioed in for a solution, he was told, "We don`t think we can resolve it."

Rosberg said the problem put more pressure on the rear brakes, causing them to overheat.

"I think it surprised us, yes, because the pace Mercedes has had all year," Ricciardo said. "Obviously, I`m still going to take the victory, don`t get me wrong. But they had their issues today, which allowed us to really make an attack.

"But it`s nice that we capitalized on that. I think it would have been disappointing if they had their issues and they were able to still get the best of us."

The second-place finish, his seventh podium in seven races, gives Rosberg 140 points of a possible 175 on the season; Hamilton is second with 118.

Ricciardo moved into third with 79 after his first career Formula 1 victory, passing Ferrari`s Fernando Alonso (69 points), and Ricciardo`s Red Bull teammate Sebastian Vettel, the four-time defending world champion, finished third and is fifth in the standings with 60 points.

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