Daniel Ricciardo is confident there is "more to come" from Red Bull after reliability issues reared their head on the final day of testing.
He covered just 10 laps on Sunday morning before an ERS problem caused his RB11 to stop at the end of pitlane.
He was, however, back out in the afternoon and brought his tally up to 72 laps.
As for his time, Ricciardo was fifth quickest, 1.575s slower than Valtteri Bottas' P1 time.
The Aussie, though, is confident there is more to come and expects Red Bull will join the battle behind Mercedes.
"We had an ERS problem in the morning but in the end we more or less did what we needed to do," Ricciardo said.
"We did a bit on lower fuel and soft tyres plus some longer runs.
"In terms of the pecking order, which is obviously what everyone wants to talk about, it’s hard to say where anyone is at.
"Aside from one team, I'd say it's pretty close after that, but we’ll see in Melbourne.
"I think there's more to come from us. Personally, I feel really ready to race now and I think we’ll be good come Melbourne."