Given Mercedes' dominance in Australia, the German marque's rivals have now begun their chase.
Second on the road in Melbourne was the later-disqualified Red Bull of Daniel Ricciardo.
"When you think about where they were three weeks ago," said Mercedes' Toto Wolff, "then we need to be really aware of what they are capable of.
"We are yet to see a reliable Vettel, and when that happens he'll be really fast," the German told Finland's Turun Sanomat newspaper.
Williams is currently regarded as the second-fastest team behind Mercedes, but technical boss Pat Symonds is expecting a tough fight in 2014.
"Look at how quickly Renault has caught up," he told...
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