A pleased Nico Rosberg said he was still searching for the perfect setup despite his dominant start to the Australian Grand Prix on Friday.
The German topped the timesheets in both practice sessions in Melbourne, ahead of Mercedes team-mate and reigning world champion Lewis Hamilton.
Rosberg was happy with his start to the Formula One season, but said he was yet to find the ideal setup heading into the weekend.
"It's been a good day for us as a team," Rosberg said after second practice.
"We've proven we have a quick car again this year and that's a pleasure to see.
"The challenge for me [is] against Lewis, he's been quick again today.
"I've done well but I'm still searching for the perfect setup and that's what it's going to come down to, I think.
"I'm still not 100 per cent happy with the way the car is handling out there."