Sebastian Vettel continued his strong form by setting the quickest time during second practice for the Hungarian Grand Prix.
Vettel's time of 1:21.264 was 0.044s faster than team-mate Mark Webber.
Romain Grosjean set the third fastest time on his second timed lap on option tyres, having made a couple of mistakes on his first run.
Ferrari was fourth and fifth, with Fernando Alonso edging out team-mate Felipe Massa.
Mercedes was unable to match the one lap pace demonstrated by their rivals as Lewis Hamilton set the sixth fastest time with Nico Rosberg in seventh.
Kimi Raikkonen's option tyre run was hindered by Jenson Button and the duo almost made contact at the final corner. Raikkonen regrouped but will still able to manage only the eighth fastest time.
Button was ninth, while Adrian Sutil - celebrating his 100th race - rounded out the top 10.
Paul di Resta was eleventh, ahead of Sergio Perez, Pastor Maldonado, Esteban Gutierrez and Nico Hulkenberg.
STR team principal Franz Tost admitted that his team was simply 'too slow', particularly through the second sector, and this limited Jean-Eric Vergne and Daniel Ricciardo to sixteenth and seventeenth place.
Valtteri Bottas was eighteenth, ahead of Charles Pic, Giedo van der Garde, Jules Bianchi and Max Chilton.
Chilton suffered a bizarre incident when debris broke his windscreen on his Marussia.
Attention soon switched to long run pace and once again it was Red Bull who appeared not only to be fastest but also the best team at preserving tyres, with Lotus and Ferrari behind and Mercedes further back.