Valtteri Bottas clocked the quickest time to put Williams on top as the second test reached its halfway point on Wednesday.
Bottas set a time of 1:23.261 on the Super Soft tyres midway through the afternoon to move ahead of Mercedes’ Lewis Hamilton, on a low-key day of testing at the Circuit de Barcelona-Catalunya.
Mercedes once again split running between its two drivers and Hamilton ended the morning on top, before being replaced by Nico Rosberg during the afternoon session.
Rosberg focused on a race simulation and adopted a Soft/Medium/Medium/Medium strategy as he posted quick and consistent lap times in the W07 Hybrid.
Kevin Magnussen concluded his pre-season testing programme with Renault by setting the third best time, 0.6 seconds down on Bottas.
Sebastian Vettel was fourth fastest as Ferrari racked up the miles, ahead of McLaren’s Jenson Button.
Daniel Ricciardo spent the morning undertaking pit stop practice and wound up sixth, while Toro Rosso once again completed a substantial number of laps as Carlos Sainz Jr. placed seventh.
Sergio Pérez finished in eighth place for Force India, ahead of Rosberg and Manor’s Pascal Wehrlein.
Marcus Ericsson had a delayed start to his day before eventually completing his first laps in the Sauber C35-Ferrari 90 minutes into the session.
He added only a handful of laps in the morning but completed more running in the afternoon until he caused a red flag, with his car stranded in the gravel at Turn 4 after losing its right rear wheel.
Haas suffered a setback in its preparations as more woe affected Esteban Gutiérrez.
Having completed only 23 laps on Tuesday before a fuel system issue struck the VF-16, Gutiérrez only notched up one installation lap half an hour into running as Haas detected an anomaly with the data.
|6||3||Daniel Ricciardo||Red Bull||1:25.235||135|
|7||55||Carlos Sainz Jr||Toro Rosso||1:25.300||166|
|8||11||Sergio Perez||Force India||1:26.188||128|
|12||21||Esteban Gutierrez||Haas||No time set||1|