Felipe Massa believes Ferrari could prove a bigger threat than initially anticipated after producing 'incredible lap times' during free practice for the Australian Grand Prix.

With Mercedes exerting its anticipated advantage in both practice sessions, attention has turned to which team would emerge as the 'best of the rest', with Williams, Ferrari and Red Bull expected to be tussling for the remaining podium positions.

However, it is Ferrari that has caught Massa's eye in particular, saying it was completing 'incredible' lap times during longer runs in the hands of Sebastian Vettel and Kimi Raikkonen.

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"Iit was an interesting session to see that Mercedes is out of the way, Ferrari is much better and we are there in the fight, and maybe Red Bull didn't show the same that we saw many times last year."

"I saw Ferrari was doing incredible lap times on the long run so we need to really open our eyes completely for them as well. But now we need to analyse where we are compared to the others and I think tomorrow we will be sure - especially after qualifying - exactly where we are."

Massa starts qualifying day at Albert Park on the back foot after a water leak necessitated a power unit change between practice sessions, forcing him to sit out FP2 entirely.