Though it may have earned him the headlines Alonso is likely to be cautious about his team's chances: he was fastest in practice at last month's Monaco Grand Prix, but could only qualify fifth.
The Mercedes again appear to be the class of the field and should lock out the front row in qualifying. Hamilton was a little over one tenth of a second clear of Rosberg in their continuing battle for supremacy.
Sebastian Vettel was fourth, ahead of Valtteri Bottas (Williams) and the second Red Bull of Daniel Ricciardo. The McLarens of Jenson Button and Kevin Magnussen enjoyed a solid session, placing seventh and eighth respectively, while Kimi Raikkonen (Ferrari) and Jean-Eric Vergne (Toro Rosso) completed the top-10.