Despite holding a comfortable advantage over Red Bull in the standings, Nico Rosberg says Mercedes need to become "bulletproof" to keep the Bulls at bay.
Last season in Montreal, Mercedes suffered their very first defeat of the year when Daniel Ricciardo took the chequered flag.
The Aussie, though, was helped on his way to victory by reliability issues for the Mercedes pairing.
Both suffered a drop in power with Lewis Hamilton's ERS issues playing a role in his brake failure, while Rosberg's meant he was caught - and eventually overtaken - by Ricciardo.
The German said: "We need to make sure that we're bulletproof.
"Having lost the win, that's very, very disappointing,...
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